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Background: Cardiovascular diseases are the leading cause of death worldwide. Subclinical alterations of the cardiovascular system, such as increased exercise blood pressure or an endothelial dysfunction confer a higher risk of manifest cardiovascular diseases and incident events. Detecting associations between circulating markers of the endocrine-metabolic system and the subclinical cardiovascular phenotypes could be useful to better understand cardiovascular disease progression and to improve risk prediction for manifest cardiovascular diseases. Methods: The associations between (a) serum thyroid-stimulating hormone and increased exercise blood pressure, (b) serum hemoglobin A1c and endothelial dysfunction as well as (c) serum insulin-like growth factor I and endothelial dysfunction were studied using cross-sectional data from around 1400 subjects aged 25 to 85 years collected during the 5-year follow-up of the population-based Study of Health in Pomerania (SHIP-1). Increased exercise blood pressure was defined as a value above the sex- and age-specific 80th percentile measured at the 100 W stage of a symptom-limited bicycle ergometry test. Endothelial dysfunction was defined as an impaired flow-mediated dilation measured as a continuous decrease or below the median of sex-specific distribution. Non-fasting blood samples were drawn from the cubital vein in the supine position. Results: The odds for increased systolic exercise blood pressure (odds ratio 1.24, 95% confidence interval 0.88; 1.76) and diastolic exercise blood pressure (odds ratio 0.98, 95% confidence interval 0.70; 1.39) as well as for exercise-induced increase of systolic and diastolic blood pressure were not significantly different between subjects with high and low serum thyroid-stimulating hormone levels within the reference range. In women without current use of antihypertensive medication, increasing serum hemoglobin A1c levels were associated with decreasing flow-mediated dilation levels (ß = -1.17, 95% confidence interval -2.03; -0.30). Such an association was not found in men. In men, logistic regression analysis revealed an odds ratio of 1.27 (95% confidence interval 1.07; 1.51) for decreased flow-mediated dilation for each decrement of serum insulin-like growth factor I standard deviation. In women, no significant association between serum insulin-like growth factor I levels and flow-mediated dilation was observed (odds ratio 0.88, 95% confidence interval 0.74; 1.05). Conclusions: Based on the presented results it is concluded that (a) serum thyroid-stimulating hormone levels are not associated with exercise blood pressure in the general population, (b) higher serum hemoglobin A1c levels in non-diabetic subjects are inversely associated with flow-mediated dilation in women without antihypertensive medication, but not in men, and (c) lower serum insulin-like growth factor I levels are associated with impaired endothelial function in men, but not in women. Therefore the metabolic marker hemoglobin A1c and the endocrine marker insulin-like growth factor I might be markers facilitating the identification of subjects at high risk of subclinical cardiovascular alterations.
Background: Alcohol consumption accounts for a high burden of disease. The general population of West Pomerania has been characterized as a population at risk with a high prevalence of behavioural risk factors such as alcohol risk drinking. This is reflected by the high proportion of patients being admitted to general hospitals due to alcohol-attributable diseases. The aims of the present dissertation were (a) to analyze dose-response relations between volume of alcohol drinking and the risk of diseases with different alcohol-attributable fractions (AAF) in general hospital inpatients (study 1); (b) to assess motivation to change drinking behaviour and motivation to seek help for alcohol problems during their hospital stay as well as changes in motivation to change drinking behaviour, motivation to seek help and changes in daily alcohol consumption across time according to diseases with different AAFs (study 2); and (c) to investigate the association of fatty liver disease (FLD) with blood pressure and hypertension in a general population sample and to test for the specific contribution of alcohol consumption to this association (study 3). Methods: For studies 1 and 2, data from 'Early Intervention at General Hospitals', a randomized controlled trial to test the effectiveness of brief intervention for alcohol problem drinking in general hospitals, were used. Study 1 comprised data from 846 inpatients, study 2 comprised data from 294 inpatients aged 18 to 64 years with alcohol problem drinking and alcohol-attributable diseases from four general hospitals in West Pomerania. Hospital diagnoses were classified according to their AAF: (1) diseases wholly attributable to alcohol consumption by definition (AAF=1), (2) diseases partially attributable to alcohol consumption (AAF<1), and (3) diseases with no relation to alcohol consumption or where alcohol consumption has been found to be a protective factor (AAF=0). Study 3 encompassed data from the 'Study of Health in Pomerania', a general population sample of 3191 adults aged 20-79 years. FLD was defined using ultrasound in combination with increased serum alanine aminotransferase levels. Results: Analyses showed that 46.8% of the general hospital inpatients had a disease attributable to alcohol consumption. There was a dose-response relationship between volume of alcohol drinking and the risk of diseases with different AAFs. Inpatients consuming >120 g and inpatients consuming 61-120 g of pure alcohol per day revealed significantly higher odds for diseases with AAF=1 compared to inpatients consuming 31-60 g of pure alcohol per day with odds ratios (OR) of 6.3 (95% CI 3.6-11.3) and 2.9 (95% CI 1.6-5.1), respectively. Regarding diseases with AAF<1, inpatients consuming >120 g of pure alcohol per day had significantly higher odds compared to inpatients consuming 31-60 g of pure alcohol per day (OR 2.0, CI 1.2-3.4). Analyses on motivation to change drinking behaviour and on motivation to seek help at hospitalization revealed that motivation to change drinking behaviour was higher among inpatients with alcohol-attributable diseases than among inpatients without alcohol-attributable diseases (p<.001). Among inpatients with AAF=1, motivation to seek help was higher than among inpatients with AAF<1 and AAF=0 (p<.001). While motivation to change drinking behaviour remained stable within one year after hospitalization in all three AAF groups, motivation to seek help decreased in this time period. The volume of alcohol consumed decreased in all three AAF groups within one year after hospitalization. Data from the general population study revealed that FLD was associated with blood pressure and hypertension at baseline and at five-year examination follow-up. For example, the chance of hypertension at both time points was threefold higher in individuals with FLD (OR 2.8, CI 1.3-6.2; OR 3.1, CI 1.7-5.8, respectively) compared to individuals without FLD. Analyses further revealed that the association of FLD with blood pressure and hypertension was independent of alcohol consumption. Conclusion: The results of the present dissertation provide relevant implications for public health. In view of the high proportion of general hospital inpatients with alcohol-attributable diseases, a screening procedure for problem drinking is needed. Furthermore, appropriate interventions considering the inpatient’s motivational level have to be implemented. The concept of AAFs to classify disease conditions according to their causal relationship with alcohol consumption might be a tool to detect inpatients with problem drinking. The results regarding FLD and its association with blood pressure and hypertension demonstrate that it is important to pay attention to alcohol-attributable diseases in the general population and that alcohol-attributable diseases are associated with subsequent serious sequelae. The results of the present work further indicate that the concept to distinguish between alcoholic and non-alcoholic origin of FLD might be obsolete and should be replaced by a concept that regards FLD as a multifactorial disease condition.
Background: It has not been investigated whether there are associations between urinary iodine (UI) excretion measurements some years apart, nor whether such an association remains after adjustment for nutritional habits. The aim of the present study was to investigate the relation between iodine-creatinine ratio (ICR) at two measuring points 5 years apart. Methods: Data from 2,659 individuals from the Study of Health in Pomerania were analyzed. Analysis of covariance and Poisson regressions were used to associate baseline with follow-up ICR. Results: Baseline ICR was associated with follow-up ICR. Particularly, baseline ICR >300 µg/g was related to an ICR >300 µg/g at follow-up (relative risk, RR: 2.20; p < 0.001). The association was stronger in males (RR: 2.64; p < 0.001) than in females (RR: 1.64; p = 0.007). In contrast, baseline ICR <100 µg/g was only associated with an ICR <100 µg/g at follow-up in males when considering unadjusted ICR. Conclusions: We detected only a weak correlation with respect to low ICR. Studies assessing iodine status in a population should take into account that an individual with a low UI excretion in one measurement is not necessarily permanently iodine deficient. On the other hand, current high ICR could have been predicted by high ICR 5 years ago.
Effectiveness of Varenicline as an Aid to Smoking Cessation in Primary Care: An Observational Study
(2012)
Aims: Although varenicline is commonly prescribed in primary care, information on smoking-related comorbidities and the effectiveness of varenicline in this context in Germany is scarce. This study assessed the efficacy and safety of varenicline in a large sample of patients seeking smoking cessation treatment through their general practitioners. The frequency of comorbidities was also evaluated. Methods: This was a 12-week, prospective, observational, non-comparative phase IV trial conducted in Germany. Abstinence rates at week 12 were evaluated by verbal reporting using the nicotine use inventory. Results: Overall, 1,391 subjects were enrolled; 1,177 received study medication and were evaluated for effectiveness and safety. At the end of the study, 71.1% (95% confidence interval 68.5–73.7) of subjects were abstinent. There were a total of 205 all-causality adverse events; 2.2% were classified as serious or severe. There were no fatal adverse events. At inclusion, 66.7% of participants had at least 1 concurrent comorbidity, with chronic obstructive pulmonary disease (35.5%), hypertension (29.6%) and depression (10.4%) being the most commonly reported. Conclusion: These real-world data indicate that varenicline is an effective and well-tolerated smoking cessation treatment when used in the primary care setting including patients with smoking-related comorbidities.
SummaryBackground: According to the literature, ductoscopy is gaining increasing importance in the diagnosis of intraductal anomalies in cases of pathologic nipple discharge. In a multicenter study, the impact of this method was assessed in comparison with that of standard diagnostics. Patients and Methods: Between 09/2006 and 05/2009, a total of 214 patients from 7 German breast centers were included. All patients underwent elective ductoscopy and subsequent ductal excision because of pathologic nipple discharge. Ductoscopy was compared with the following standard diagnostics: breast sonography, mammography, magnetic resonance imaging (MRI), galactography, cytologic nipple swab, and ductal lavage cytology. The histological and imaging results were compared and contrasted to the results obtained from the nipple swab and cytologic assessment. Results: Sonography had the highest (82.9%) sensitivity, followed by MRI (82.5%), galactography (81.3%), ductoscopy (71.2%), lavage cytology (57.8%), mammography (57.1%), and nipple swab (22.8%). Nipple swabs had the highest (85.5%) specificity, followed by lavage cytology (85.2%), ductoscopy (49.4%), galactography (44.4%), mammography (33.3%), sonography (17.9%), and MRI (11.8%). Conclusion: Currently, ductoscopy provides a direct intraoperative visualization of intraductal lesions. Sensitivity and specificity are similar to those of standard diagnostics. The technique supports selective duct excision, in contrast to the unselective technique according to Urban. Therefore, ductoscopy extends the interventional/diagnostic armamentarium.
Prostate volume estimation in MR images for epidemiological and clinical studies – new methods
(2014)
Benign prostatic hyperplasia (BPH) is one of the most widespread diseases among men older than 50 years. The literature provides various cut-off values for pathological enlargement of the prostate. Prostate volume (PV) measurement in large population-based studies would allow deriving more objective reference values and a more valid early BPH diagnosis. A fully automated method is therefore required. In the clinical context, the measurement of the PV is important for treatment response monitoring in the clinical applications for BPH management research, and an accurate method for PV is essential. Magnetic Resonance Imaging was used for PV estimation. Two methods based on the Support Vector Machines (SVM) were developed: the binary Support Vector Machines (C SVM)-based method for epidemiological studies and the single-class Support Vector Machines (S SVM)-based method for clinical studies. The second method was additionally compared to the ellipsoid formula for PV estimation, which is widespread in the clinic. The comparison between volume measurement of the C SVM-based method and manual delineation of observers A and B yielded a strong correlation (Spearmans rank correlation coefficients ñ of 0.936 [p < 0.001] and 0.859 [p < 0.001], respectively). Comparing the C SVM-based method and the two manual delineations by observers A and B shows an agreement with a mean difference of 3.0 ml (95% confidence interval of -3.1 to +9.2 ml) and 1.9 ml (95% confidence interval of −7.1 to +10.8 ml), respectively. The S SVM-based method and the reference PV (manual delineation of observer A) show excellent correlation (Spearmans rank correlation coefficient ñ = 0.965, p < 0.001), while the ellipsoid formula is less well correlated with the reference PV (Spearmans rank correlation coefficient ñ = 0.873, p < 0.001). The mean difference between S SVM and the reference PV was −0.05 ml (95% confidence interval of −3.8 to +3.7 ml); on the other hand, the mean difference between the ellipsoid formula and the reference PV was much greater, with 8.6 ml (95% confidence interval of +1 to +16.2 ml). The C SVM-based method has considerable potential for integration in epidemiological studies. The prostate volumes obtained by the S SVM-based method agreed excellently with the reference and would be clinically useful for urologists in prostate volumetric analysis.
Type 2 diabetes mellitus is one of the most challenging health problems for the next decades. The impact of type 2 diabetes mellitus on health care systems is largely driven by the increasing prevalence, the management of the disease and subsequent comorbidities, even in people with prediabetes or undiagnosed type 2 diabetes mellitus. An early detection of high risk groups is necessary to identify and modify risk factors such as obesity, physical inactivity or cigarette smoking which showed regional disparities in their distribution within a country. This leads to the assumption that there might be regional disparities regarding the prevalence and incidence of type 2 diabetes mellitus as well. For Germany as for other countries, comparable data on possible regional disparities in the prevalence and incidence of type 2 diabetes mellitus are missing. The aim of the present dissertation is to estimate the prevalence and incidence of type 2 diabetes mellitus on regional level within Germany, and to estimate the smoking prevalence as a modifiable risk factor in individuals with type 2 diabetes mellitus using data from the Diabetes Collaborative Research of Epidemiologic Studies consortium (DIAB CORE) within the Competence Net Diabetes in Germany. Well comparable data of five regional studies and one nationwide reference study are included: the Study of Health in Pomerania (SHIP); the Cardiovascular Disease, Living and Ageing in Halle Study (CARLA); the Dortmund Health Study (DHS); the Heinz Nixdorf Recall Study (HNR); the Cooperative Health Research in the Region of Augsburg Study (KORA); and the German National Health Interview and Examination Survey 1998 (GNHIES 98). First, the prevalence of type 2 diabetes mellitus was estimated. Data from five regional population-based studies and one nationwide study conducted between 1997 and 2006 with participants aged 45 to 74 years were analyzed. Type 2 diabetes mellitus prevalence estimates based on self-reports (standardized to the German population for the regional studies, reference date 2007/12/31) were compared. Of 11,688 participants of the regional studies, 1,008 had a known type 2 diabetes mellitus, corresponding to a prevalence of 8.6% (95% confidence interval [CI] 8.1% 9.1%). The standardized prevalence was highest in the East with 12.0% (95% CI 10.3% 13.7%) and lowest in the South of Germany with 5.8% (95% CI 4.9% 6.7%).Second, the incidence of type 2 diabetes mellitus was estimated. Data from participants (baseline age 45 to 74 years) from five regional population-based studies were included. The incidence rates per 1,000 person-years (95% CI) and the cumulative incidence (95% CI) from regional studies were directly standardized to the German population (reference date 2007/12/31) and weighted by inverse probability weights for losses to follow-up. Of 8,787 participants, 521 (5.9%) developed type 2 diabetes mellitus corresponding to an incidence rate of 11.8 per 1,000 person-years (95% CI 10.8 12.9). The incidence of known type 2 diabetes mellitus showed regional disparities within Germany. The incidence was highest in the East and lowest in the South of Germany with 16.9 (95% CI 13.3 21.8) vs. 9.0 (95% CI 7.4 11.1) per 1,000 person-years, respectively. Third, the smoking prevalence in participants aged 20 to 79 years with type 2 diabetes mellitus in the regional SHIP and the nationwide GNHIES 98 was estimated. Prevalence estimates of cigarette smoking were calculated using weights reflecting the European adult population (reference date 2005/12/31). The overall prevalence of current smoking was lower among participants with type 2 diabetes mellitus than among participants without type 2 diabetes mellitus (17.3% vs. 38.0% in SHIP and 24.7% vs. 32.1% in GNHIES 98). In both studies, the prevalence of current smoking was highest in men aged 20 to 39 years, in particular among men with type 2 diabetes mellitus. To conclude, considerable disparities in prevalence and incidence of type 2 diabetes mellitus indicate the need for interventions on the regional level within Germany. Former smoking was more prevalent among both men and women with type 2 diabetes mellitus in comparison to current and non-smoking. This finding probably reflects behavioural changes secondary to the disease onset and medical counselling. The finding that men aged 20 to 39 years with type 2 diabetes mellitus were more often current smokers than men without type 2 diabetes mellitus underpins the importance of smoking as one of the main modifiable risk factors for type 2 diabetes mellitus.
Context: 3,5-Diiodo-<smlcap>L</smlcap>-thyronine (3,5-T<sub>2</sub>) is a thyroid hormone metabolite which exhibited versatile effects in rodent models, including the prevention of insulin resistance or hepatic steatosis typically forced by a high-fat diet. With respect to euthyroid humans, we recently observed a putative link between serum 3,5-T<sub>2</sub> and glucose but not lipid metabolism. Objective: The aim of the present study was to widely screen the urine metabolome for associations with serum 3,5-T<sub>2</sub> concentrations in healthy individuals. Study Design and Methods: Urine metabolites of 715 euthyroid participants of the population-based Study of Health in Pomerania (SHIP-TREND) were analyzed by <sup>1</sup>H-NMR spectroscopy. Multinomial logistic and multivariate linear regression models were used to detect associations between urine metabolites and serum 3,5-T<sub>2</sub> concentrations. Results: Serum 3,5-T<sub>2</sub> concentrations were positively associated with urinary levels of trigonelline, pyroglutamate, acetone and hippurate. In detail, the odds for intermediate or suppressed serum 3,5-T<sub>2</sub> concentrations doubled owing to a 1-standard deviation (SD) decrease in urine trigonelline levels, or increased by 29-50% in relation to a 1-SD decrease in urine pyroglutamate, acetone and hippurate levels. Conclusion: Our findings in humans confirmed the metabolic effects of circulating 3,5-T<sub>2</sub> on glucose and lipid metabolism, oxidative stress and enhanced drug metabolism as postulated before based on interventional pharmacological studies in rodents. Of note, 3,5-T<sub>2</sub> exhibited a unique urinary metabolic profile distinct from previously published results for the classical thyroid hormones.
Previous studies on the antimicrobial activity of cold atmospheric pressure argon plasma showed varying effects against mecA<sup>+</sup> or mecA<sup>-</sup>Staphylococcus aureus strains. This observation may have important clinical and epidemiological implications. Here, the antibacterial activity of argon plasma was investigated against 78 genetically different S. aureus strains, stratified by mecA, luk-P, agr1-4, or the cell wall capsule polysaccharide types 5 and 8. kINPen09® served as the plasma source for all experiments. On agar plates, mecA<sup>+</sup>luk-P<sup>-</sup>S. aureus strains showed a decreased susceptibility against plasma compared to other S. aureus strains. This study underlines the high complexity of microbial defence against antimicrobial treatment and confirms a previously reported strain-dependent susceptibility of S. aureus to plasma treatment.
Background: The plasminogen activator system plays a key role in ovarian cancer (OC) tumor progression. The plasminogen activator inhibitor type 1 (PAI-1) and the recently identified PAI-1 RNA binding protein 1 (PAI-RBP1) are primary regulators of plasminogen activation and thus are putative biomarkers for OC progression. Methods: One hundred fifty six OC patients were analyzed to identify the presence of PAI-1 and PAI-RBP1 and subsequently correlated to clinicopathological parameters. Primary cells obtained from OC patient samples were applied in fluorescence microscopy analysis for examination of PAI-1 and PAI-RBP1 distribution. Results: PAI-1 and PAI-RBP1 have been found to be predictive markers for OC patients' outcome. PAI-1 levels significantly correlated with volume of ascites, FIGO staging, and lymph node status. PAI-RBP1 expression significantly correlated with age at first diagnosis, histological tumor type, presence of distant metastasis (pM), and recurrence. PAI-1 showed a trend toward association and PAI-RBP1 was significantly associated with progression-free survival. Notably, PAI-1 protein in recurrent OC tissues was exclusively localized in the nucleus. Conclusion: This study has shown that a combination of PAI-1 and PAI-RBP1 may represent novel prognostic factor for OC. Prospective trials are needed.
Activation of trace amine-associated receptor 1 (TAAR1) in endocrine pancreas is involved in weight regulation and glucose homeostasis. The purpose of this study was the identification and characterization of potential TAAR1 variants in patients with overweight/obesity and disturbed glucose homeostasis. Screening for TAAR1 variants was performed in 314 obese or overweight patients with impaired insulin secretion. The detected variants were functionally characterized concerning TAAR1 cell surface expression and signaling properties and their allele frequencies were determined in the population-based Study of Health in Pomerania (SHIP). Three heterozygous carriers of the single nucleotide missense variants p.Arg23Cys (R23C, rs8192618), p.Ser49Leu (S49L, rs140960896), and p.Ille171Leu (I171L, rs200795344) were detected in the patient cohort. While p.Ser49Leu and p.Ille171Leu were found in obese/overweight patients with slightly impaired glucose homeostasis, p.Arg23Cys was identified in a patient with a complete loss of insulin production. Functional in vitro characterization revealed a like wild-type function for I171L, partial loss of function for S49L and a complete loss of function for R23C. The frequency of the R23C variant in 2018 non-diabetic control individuals aged 60 years and older in the general population-based SHIP cohort was lower than in the analyzed patient sample. Both variants are rare in the general population indicating a recent origin in the general gene pool and/or the consequence of pronounced purifying selection, in line with the obvious detrimental effect of the mutations. In conclusion, our study provides hints for the existence of naturally occurring TAAR1 variants with potential relevance for weight regulation and glucose homeostasis.
Background: Securing future blood supply is a major issue of transfusion safety. In this prospective 10-year longitudinal study we enrolled all blood donation services and hospitals of the federal state Mecklenburg-Western Pomerania. Methods and Results: From 2005 to 2015 (time period with major demographic effects), whole blood donation numbers declined by 18%. In male donors this paralleled the demographic change, while donation rates of females declined 12.4% more than expected from demography. In parallel, red cell transfusion rates/1,000 population decreased from 2005 to 2015 from 56 to 51 (-8.4%), primarily due to less transfusions in patients >60 years. However, the transfusion demand declined much less than blood donation numbers: -13.5% versus -18%, and the population >65 years (highest transfusion demand) will further increase. The key question is whether the decline in transfusion demand observed over the previous years will further continue, hereby compensating for reduced blood donation numbers due to the demographic change. The population structure of Mecklenburg-Western Pomerania reflects all Eastern German federal states, while the Western German federal states will reach similar ratios of age groups 18-64 years / ≥65 years about 10 years later. Conclusions: Regular monitoring of age- and sex-specific donation and transfusion data is urgently required to allow transfusion services strategic planning for securing future blood supply.
Do We Need to Rethink the Epidemiology and Healthcare Utilization of Parkinson's Disease in Germany?
(2018)
Epidemiological aspects of Parkinson's disease (PD), co-occurring diseases and medical healthcare utilization of PD patients are still largely elusive. Based on claims data of 3.7 million statutory insurance members in Germany in 2015 the prevalence and incidence of PD was determined. PD cases had at least one main hospital discharge diagnosis of PD, or one physician diagnosis confirmed by a subsequent or independent diagnosis or by PD medication in 2015. Prevalence of (co-)occurring diseases, mortality, and healthcare measures in PD cases and matched controls were compared. In 2015, 21,714 prevalent PD cases (standardized prevalence: 511.4/100,000 persons) and 3,541 incident PD cases (standardized incidence: 84.1/100,000 persons) were identified. Prevalence of several (co-)occurring diseases/complications, e.g., dementia (PD/controls: 39/13%), depression (45/22%), bladder dysfunction (46/22%), and diabetes (35/31%), as well as mortality (10.7/5.8%) differed between PD cases and controls. The annual healthcare utilization was increased in PD cases compared to controls, e.g., regarding mean ± SD physician contacts (15.2 ± 7.6/12.2 ± 7.3), hospitalizations (1.3 ± 1.8/0.7 ± 1.4), drug prescriptions (overall: 37.7 ± 24.2/21.7 ± 19.6; anti-PD medication: 7.4 ± 7.4/0.1 ± 0.7), assistive/therapeutic devices (47/30%), and therapeutic remedies (57/16%). The standardized prevalence and incidence of PD in Germany as well as mortality in PD may be substantially higher than reported previously. While frequently diagnosed with co-occurring diseases/complications, such as dementia, depression, bladder dysfunction and diabetes, the degree of healthcare utilization shows large variability between PD patients. These findings encourage a rethinking of the epidemiology and healthcare utilization in PD, at least in Germany. Longitudinal studies of insurance claims data should further investigate the individual and epidemiological progression and healthcare demands in PD.
Mendelian randomization (MR) is a framework for assessing causal inference using cross-sectional data in combination with genetic information. This paper summarizes statistical methods commonly applied and strait forward to use for conducting MR analyses including those taking advantage of the rich dataset of SNP-trait associations that were revealed in the last decade through large-scale genome-wide association studies. Using these data, powerful MR studies are possible. However, the causal estimate may be biased in case the assumptions of MR are violated. The source and the type of this bias are described while providing a summary of the mathematical formulas that should help estimating the magnitude and direction of the potential bias depending on the specific research setting. Finally, methods for relaxing the assumptions and for conducting sensitivity analyses are discussed. Future researches in the field of MR include the assessment of non-linear causal effects, and automatic detection of invalid instruments.
Mendelian randomization (MR) is a framework for assessing causal inference using cross-sectional data in combination with genetic information. This paper summarizes statistical methods commonly applied and strait forward to use for conducting MR analyses including those taking advantage of the rich dataset of SNP-trait associations that were revealed in the last decade through large-scale genome-wide association studies. Using these data, powerful MR studies are possible. However, the causal estimate may be biased in case the assumptions of MR are violated. The source and the type of this bias are described while providing a summary of the mathematical formulas that should help estimating the magnitude and direction of the potential bias depending on the specific research setting. Finally, methods for relaxing the assumptions and for conducting sensitivity analyses are discussed. Future researches in the field of MR include the assessment of non-linear causal effects, and automatic detection of invalid instruments.
Iodine deficiency disorders (IDD) result from insufficient iodine intake, and may lead to many adverse effects on growth, development and thyroid diseases in humans.
Pakistan is a country with history of iodine deficiency.
Before reunification both parts of Germany were iodine deficient. In the Eastern part, however, due to mandatory iodine prophylaxis adaptation in 1983, the iodine status of the population improved from moderate to mild iodine deficiency. After the reunification of Germany in 1989 “voluntary principle” was adopted leading again to a decrease in iodine intake. Germany and Pakistan present different socioeconomics, cultural values and adaptations to the IDD eradication but have resemblance in history of iodine deficiency. In the recent years Germany has improved in IDD eradication more than Pakistan. The purpose of this research was to study the regional influence on iodine nutritional status of pregnant women in Pakistan and to monitor the effectiveness of the iodine fortification programme in the North-East German population.
Pregnant women data was obtained from randomly selected (public and private) prenatal clinics in five districts of the KPK province of Pakistan. Women visited there for their routine checkup between March and September 2012. Data were obtained from almost 250 pregnant women from each district reaching to a total of 1260 in all five districts.
The SHIP project consists of two population-based cohorts, for which only individuals with German citizenship and main residency in the study area were recruited. In the first SHIP cohort; SHIP-0, individuals aged 20-79 years were selected from population registries by a two-stage cluster sampling method. The net sample (without migrated or deceased persons) comprised 6265 eligible subjects, of which 4308 (response 68.8%) participated between 1997 and 2001. A separate stratified random sample of 8826 adults aged 20-79 years was drawn for SHIP-Trend, of which 4420 subjects participated between 2008 and 2012 (response 50.1%) in SHIP-Trend-0.
All the pregnant women were asked to complete a short interview questionnaire containing the information related to sources and reasons for intake and non-intake of iodized salt. The questionnaire also comprised questions related to knowledge of iodized salt nutrition. Information on the number of previous pregnancies and/or abortions (fetal loss due to various reasons, not including voluntary termination of pregnancy) was also obtained. The gestational age of the pregnant women was determined from the first day of the last regular menstrual period with gestational ages of ≤14.9, 28.9, and ≥29 weeks comprising the first, second, and third trimesters of pregnancy, respectively. For goiter assessment in pregnant women the WHO/UNICEF/IGN recommended palpation method was used. UIC was measured using a modification of the Sandell-Kolthoff reaction with spectrophotometric detection. Evaluation of group iodine status was based on median UIC categories defined by the WHO/IGN. These are: recommended – median 150-249 μg/L; mild iodine deficiency – median <150 μg/L.
For the analysis of monitoring trends of thyroid diseases in SHIP, diagnosed thyroid disorders were assessed by computer-assisted personal interviews. Medication data were obtained online using the IDOM program (online drug-database leaded medication assessment) and classified according to the Anatomical-Therapeutic-Chemical (ATC) classification system.In SHIP population goiter assessment was based on thyroid volume determined with ultrasonography. Goiter was defined as a thyroid volume exceeding 18 mL in women and 25 mL in men. Urinary iodine concentrations were measured from spot urine samples by a photometric procedure. Urinary creatinine concentrations were determined with the Jaffé method. Evaluation of group iodine status was based on median UIC categories defined by the WHO/IGN. The iodine/creatinine ratio was calculated by dividing urinary iodine by urinary creatinine concentrations. Serum TSH, fT3, fT4 levels in SHIP study were measured by an immunochemiluminescent procedure. A method comparison between the two TSH laboratory methods showed only negligible differences. High and low serum TSH levels were based on the reference range established from data for SHIP-0 (0.25 mIU/L - 2.12 mIU/L) and SHIP-TREND-0 (0.49 mIU/L - 3.29 mIU/L) respectively (21,22). Anti-TPO Abs were measured by an enzyme immunoassay in the whole SHIP study. The anti-TPO Abs status was defined as follows: normal < 60 IU/ml in men and < 100 IU/ml in women; increased > 60 IU/ml in men and > 100 IU/ml in women; positive: > 200 IU/ml in both sexes.
Thyroid ultrasonography was performed in SHIP-0 using an ultrasound VST-Gateway with a 5 MHz linear array transducer. In SHIP-Trend-0 ultrasonography was performed with a portable device using a 13-MHz linear array transducer. In both studies intra- and inter-observer reliabilities were assessed before the start of the study and semi-annually during the study. For thyroid volume all inter-observer and inter-device variabilities showed mean differences (±2 SD)of < 5% (<25%). Thyroid volume was calculated as length x width x depth x 0.479 (ml) for each lobe (26). The normal thyroid echo pattern was classified as homogeneous. A homogeneous echo pattern with reduced echogenicity was defined as hypoechogenic. Nodular changes exceeding 10 mm in diameter were defined as thyroid nodules.
Multivariable logistic regression analysis adjusting for age was used to regress the outcome measures (knowledge about IDD, iodized salt intake, UIC <150mIU/L and goiter prevalence) on regional influences (as exposure) in each specific district. These results are presented as odd ratios and their 95% confidence interval.
For the analysis in SHIP, all analyses were standardized by base-weights to account for different sampling probabilities. In SHIP-Trend-0, additionally, inverse probability weights for study participation were calculated, which were multiplied with the base-weights. Differences in median levels between SHIP-0 and SHIP-Trend-0 were tested by median regression models; prevalence differences between SHIP-0 and SHIP-Trend-0 were tested by Poisson regression models.
The majority of pregnant women (88.0%) had no knowledge about IDD. A very high (79%) percentage of pregnant women were not taking iodized salt, out of which 36.6% reported that iodized salt would negatively affect reproduction and for 17.0%, it was too expensive. Iodized salt intake in pregnant women was high in the big cities (Peshawar, Nowshehra) and in the urban areas (27.0%)
In 41.3% of the pregnant women, we observed a UIC of >150mIU/L. The median UIC level for the pregnant women was 131µg/L. The total goiter prevalence in pregnant women was 25.5%. The prevalence of UIC <150mIU/L in pregnant women did not differ between rural and urban areas. The results based on logistic regression analysis shows that the prevalence on knowledge about IDD, iodized salt intake, UIC <150mIU/L, and goiter did not differ in pregnant women between urban and rural areas. In district Lakki Marwat except, the pregnant women from urban residence had higher odds of having knowledge on IDD and iodized salt intake than their rural counterparts.
The prevalence of diagnosed thyroid disorders increased from 7.6% [CI 6.9-8.5] in SHIP-0 to 18.9% [CI 17.6-20.1] in SHIP-Trend-0. Likewise, the prevalence of thyroid medication intake increased from 6.2% [CI 5.5-7.0] to 11.1% [CI 10.1-12.2]. The median urinary iodine excretion levels decreased significantly, which was more pronounced in females than in males. The median iodine-to-creatinine ratio declined in all sex- and age-groups with stronger decrease in females than in males. The prevalence of median urinary iodine excretion levels <100µg/L increased between SHIP-0 and SHIP-Trend-0. Median serum TSH levels increased significantly between SHIP-0 and SHIP-Trend-0, resulting in a right shift of the serum TSH level distribution. The prevalence of high serum TSH levels remained almost stable between SHIP-0 and SHIP-Trend-0. Likewise, the prevalence of low TSH remained almost stable between SHIP-0 and SHIP-Trend-0. The prevalence of increased anti-TPO Abs and positive anti-TPO Abs decreased from SHIP-0 to SHIP-Trend-0 in the whole study population. The prevalence of hypoechogenic thyroid pattern decreased from SHIP-0 to SHIP-Trend-0. The median thyroid volume remained similar between SHIP-0 and SHIP-Trend-0 in the whole study population. Goiter prevalence decreased significantly; more pronounced in males than in females, while the prevalence of thyroid nodules increased between SHIP-0 and SHIP-Trend-0.
In pregnant women in Pakistan due to insufficient awareness campaigns and low literacy ratio in rural areas urinary iodine excretion levels indicate a stable iodine supply, which is still not sufficient. Our results show that rural/urban disparity is affecting the IDD prevention program in rural districts, but not in general. The SHIP data indicate that the improved iodine supply over the past two decades in Germany is paralleled by a reduction in prevalence of IDDs, while no increase was observed in markers of autoimmune thyroid disorders arguing for an optimal iodine supply of the general adult population in Northeast Germany. The increase in prevalence of diagnosed thyroid disorders and the intake of thyroid medication might be because of inappropriate therapeutical decisions which should be made with caution, based on regional TSH reference ranges, its prognostic value, and compliance with treatment.
Background: Iodine deficiency disorders (IDD) represent a global health threat to individuals and societies. IDD prevention programmes have been introduced in many parts of the world. However, challenges remain, particularly in Europe due to fragmentation and diversity of approaches that are not harmonized. Objectives: This review is dedicated to the public-health impact of IDD prevention programmes. It sums up experiences collected by the EUthyroid consortium so far and provides information on stakeholders that should be involved in actions directed to improve the impact of IDD prevention. Methods: A joint European database for combining registry-based outcome and monitoring data as well as tools for harmonizing study methods were established. Methods for analyzing thyroglobulin from a dried blood spot are available for assessing the iodine status in the general population and at-risk groups. Mother-child cohorts are used for in-depth analysis of the potential impact of mild-to-moderate iodine deficiency on the neurocognitive development of the offspring. A decision-analytic model has been developed to evaluate the long-term effectiveness and cost effectiveness of IDD prevention programmes. Results: EUthyroid has produced tools and infrastructure to improve the quality of IDD monitoring and follows a dissemination strategy targeting policymakers and the general public. There are tight connections to major stakeholders in the field of IDD monitoring and prevention. Conclusions: EUthyroid has taken steps towards achieving a euthyroid Europe. Our challenge is to inspire a greater sense of urgency in both policymakers and the wider public to address this remediable deficit caused by IDD.
Mean platelet volume is more important than age for defining reference intervals of platelet counts
(2019)
Introduction: Hearing and vision loss are highly prevalent in elderly adults, and thus frequently occur in conjunction with cognitive impairments. Studies have shown that hearing impairment is associated with a higher risk of dementia. However, evidence concerning the association between vision loss and dementia, as well as the co-occurrence of vision and hearing loss and dementia, has been inconclusive.
Objectives: To assess the association between: (i) either hearing or vision loss and the risk of dementia, as well as between; and (ii) the combination of both sensory impairments and the risk of dementia.
Methods: This case-control study was based on a 5-year data set that included patients aged 65 years and older who had initially been diagnosed with dementia diseases by one of 1,203 general practitioners in Germany between January 2013 and December 2017. In total, 61,354 identified dementia cases were matched to non-dementia controls, resulting in a sample size of 122,708 individuals. Hearing loss and vision loss were identified using the ICD-10 diagnoses documented in the general practitioners’ files prior to the initial dementia diagnosis. Multivariate logistic regression models were fitted to evaluate the associations between visual and/or hearing impairment and the risk of dementia and controlled for sociodemographic and clinical variables.
Results: Hearing impairment was documented in 11.2% of patients with a dementia diagnosis and 9.5% of patients without such a diagnosis. Some form of vision impairment was documented in 28.4% of patients diagnosed with dementia and 28.8% of controls. Visual impairment was not significantly associated with dementia (OR = 0.97, CI = 95% 0.97–1.02, p = 0.219). However, patients with hearing impairment were at a significantly higher risk of developing dementia (OR = 1.26, CI = 95% 1.15–1.38, p < 0.001), a finding that very likely led to the observed significant association of the combination of both visual and hearing impairments and the risk of dementia (OR = 1.14, CI = 95% 1.04–1.24, p = 0.005).
Discussion: This analysis adds important evidence that contributes to the limited body of knowledge about the association between hearing and/or vision loss and dementia. It further demonstrates that, of the two, only hearing impairment affects patients’ cognition and thus contributes to dementia risk.
Background
In combination with systematic routine screening, brief alcohol interventions have the potential to promote population health. Little is known on the optimal screening interval. Therefore, this study pursued 2 research questions: (i) How stable are screening results for at‐risk drinking over 12 months? (ii) Can the transition from low‐risk to at‐risk drinking be predicted by gender, age, school education, employment, or past week alcohol use?
Methods
A sample of 831 adults (55% female; mean age = 30.8 years) from the general population was assessed 4 times over 12 months. The Alcohol Use Disorders Identification Test—Consumption was used to screen for at‐risk drinking each time. Participants were categorized either as low‐risk or at‐risk drinkers at baseline, 3, 6, and 12 months later. Stable and instable risk status trajectories were analyzed descriptively and graphically. Transitioning from low‐risk drinking at baseline to at‐risk drinking at any follow‐up was predicted using a logistic regression model.
Results
Consistent screening results over time were observed in 509 participants (61%). Of all baseline low‐risk drinkers, 113 (21%) received a positive screening result in 1 or more follow‐up assessments. Females (vs. males; OR = 1.66; 95% confidence intervals [95% CI] = 1.04; 2.64), 18‐ to 29‐year‐olds (vs. 30‐ to 45‐year‐olds; OR = 2.30; 95% CI = 1.26; 4.20), and those reporting 2 or more drinking days (vs. less than 2; OR = 3.11; 95% CI = 1.93; 5.01) and heavy episodic drinking (vs. none; OR = 2.35; 95% CI = 1.06; 5.20) in the week prior to the baseline assessment had increased odds for a transition to at‐risk drinking.
Conclusions
Our findings suggest that the widely used time frame of 1 year may be ambiguous regarding the screening for at‐risk alcohol use although generalizability may be limited due to higher‐educated people being overrepresented in our sample.
Obesity and diabetes have reached epidemic proportions and have emerged as massive public health problems globally. The etiology of both obesity and diabetes are related, multifactorial, highly complex, and involves interplay of genetic, environmental, socio-economic and physiological factors, which calls for a more extensive research in understanding the risk factors and biological pathways. Hence, this dissertation contributed in part to understanding the role of iron markers in the development of type 2 diabetes mellitus and the role of intrauterine hyperglycemia in influencing the risk of offspring obesity along with investigating potential pathways.
In the first part of my dissertation, the associations of iron markers (ferritin and transferrin) with type 2 diabetes mellitus and metabolic syndrome were investigated using the population-based Study of Health in Pomerania. The present analyses were based on 3,232 participants aged 20-81 years with a follow-up time of nearly 11 years. The results suggest that serum ferritin concentrations were associated with a higher prevalence of type 2 diabetes mellitus and metabolic syndrome in the total population as well as in men. However, the effects of serum ferritin on incident type 2 diabetes mellitus were observed only in women, while the effects on incident metabolic syndrome were seen in the total population. Serum ferritin is also known to reflect systemic inflammation or hepatic dysfunction in addition to increased iron stores. Hence, upon further analyses, the associations were found to be attenuated after adjustment for hepatic enzymes but not after adjustment for inflammation. Transferrin was not associated with any of the outcomes. Thus, our study provides evidence for a link between the iron marker ferritin and type 2 diabetes mellitus and metabolic syndrome, although the association seemed to vary by sex. Moreover, hepatic dysfunction seems likely to be in the pathway between ferritin and type 2 diabetes mellitus and metabolic syndrome.
In the second part of my dissertation, the association between maternal hyperglycemia and the risk of offspring overweight and obesity were investigated using three different cohorts: TEDDY, TEENDIAB and BABYDIAB/BABYDIET. The present analyses were based on a total of 8,103 children who were followed until 6 years of age in TEDDY study and until 18 years of age in TEENDIAB and BABYDIAB/BABYDIET studies. The dissertation revealed that maternal hyperglycemia in general may be associated with increased risk for childhood overweight and obesity, and that the association gets stronger as children grow older, with the risk being clearly evident at late childhood and adolescence. Moreover, this dissertation adds that this association can be driven by different pathways based on the type of maternal diabetes to which the offspring was exposed. The association of maternal gestational diabetes mellitus with offspring overweight can be largely explained by the confounding influence of maternal BMI, whereas the association of maternal type 1 diabetes mellitus with offspring overweight can be substantially explained by birthweight in all three studies. In our attempt to understand biological pathways at a cellular level, we found that the offspring metabolome was unlikely to be in the causal pathway between maternal type 1 diabetes mellitus and overweight, because this association could not be explained by any of the potentially relevant metabolites.
To conclude, this dissertation acknowledges the fact that prevention and early intervention of obesity and diabetes is of paramount importance to lessen the impact of these public health problems. Thus, our findings of the role of ferritin in increasing the risk of type 2 diabetes mellitus/ metabolic syndrome and the role of intrauterine hyperglycemia in increasing the risk of offspring overweight helped to identify particular risk groups who may need closer attention with respect to prevention of obesity and diabetes.
Abstract
Purpose
This study aims to assess the implementation of published research, contraindications, and warnings on the prescription of dual renin‐angiotensin‐hormone system (RAS) blockade in ambulatory care in Germany.
Methods
Cohort study based on health claims data of 6.7 million subjects from 2008 to 2015. Yearly prevalence and incidence for dual RAS blockade with (a) angiotensin‐converting enzyme inhibitors and angiotensin‐receptor blockers (ACEI + ARB) and (b) aliskiren and ACEI or ARB (aliskiren + ACEI/ARB) were calculated. We assessed prescriber specialty and associations between discontinuing dual RAS blockade with specialist (internal medicine, cardiology, nephrology) visits and hospital discharge in the previous year.
Results
A total of 2 984 517 patients were included (age 51.4 ± SD 18.4 y, 48.5% male). Prescription rates for ACEI + ARB decreased from 0.6% (n = 17 907) to 0.4% (n = 12 237) and for aliskiren + ACEI/ARB from 0.23% (n = 6634) to 0.03% (n = 818). Incident prescriptions decreased from 0.23% (n = 6705) to 0.19% (n = 5055) (ACE + ARB) and from 0.1% (n = 2796) to 0.005% (n = 142) (aliskiren + ACE/ARB); 59% of ACEI + ARB and 48% of aliskiren + ACE/ARB combinations were prescribed only by one physician. Of those, 73% (ACEI + ARB) and 58% (aliskiren + ACE/ARB) were primary care providers (PCPs). Discontinuing dual RAS blockade was associated with specialist care and hospital discharge in the previous year (specialist care: RR 1.4, 95% CI, 1.3‐1.6; hospital visit: RR 1.5, 95% CI, 1.3‐1.6).
Conclusions
Our results suggest a delayed uptake of treatment recommendation for ACEI + ARB and a higher impact of Dear Doctor letters addressing PCPs directly compared with published research, contraindications, and warnings. Targeted continuous medical education, practice software alerts, and stronger involvement of pharmacists might improve the implementation of medication safety recommendations in ambulatory care.
Analysis based on claims data showed no clinical benefit from AGR intervention regarding theinvestigated outcomes. The slightly worse outcomes may reflect limitations in matching based on claims data,which may have insufficiently reflected morbidity and psychosocial factors. It is possible that the interventiongroup had poorer health status at baseline compared to the control group.
Scope
Previous work identified three metabolically homogeneous subgroups of individuals (“metabotypes”) using k‐means cluster analysis based on fasting serum levels of triacylglycerol, total cholesterol, HDL cholesterol, and glucose. The aim is to reproduce these findings and describe metabotype groups by dietary habits and by incident disease occurrence.
Methods and results
1744 participants from the KORA F4 study and 2221 participants from the KORA FF4 study are assigned to the three metabotype clusters previously identified by minimizing the Euclidean distances. In both KORA studies, the assignment of participants results in three metabolically distinct clusters, with cluster 3 representing the group of participants with the most unfavorable metabolic characteristics. Individuals of cluster 3 are further characterized by the highest incident disease occurrence during follow‐up; they also reveal the most unfavorable diet with significantly lowest intakes of vegetables, dairy products, and fibers, and highest intakes of total, red, and processed meat.
Conclusion
The three metabotypes originally identified in an Irish population are successfully reproduced. In addition to this validation approach, the observed differences in disease incidence across metabotypes represent an important new finding that strongly supports the metabotyping approach as a tool for risk stratification.
Introduction
Bipolar disorder (BD) is characterized by recurrent episodes of depression and mania and affects up to 2% of the population worldwide. Patients suffering from bipolar disorder have a reduced life expectancy of up to 10 years. The increased mortality might be due to a higher rate of somatic diseases, especially cardiovascular diseases. There is however also evidence for an increased rate of diabetes mellitus in BD, but the reported prevalence rates vary by large.
Material and Methods
85 bipolar disorder patients were recruited in the framework of the BiDi study (Prevalence and clinical features of patients with Bipolar Disorder at High Risk for Type 2 Diabetes (T2D), at prediabetic state and with manifest T2D) in Dresden and Würzburg. T2D and prediabetes were diagnosed measuring HBA1c and an oral glucose tolerance test (oGTT), which at present is the gold standard in diagnosing T2D. The BD sample was compared to an age-, sex- and BMI-matched control population (n = 850) from the Study of Health in Pomerania cohort (SHIP Trend Cohort).
Results
Patients suffering from BD had a T2D prevalence of 7%, which was not significantly different from the control group (6%). Fasting glucose and impaired glucose tolerance were, contrary to our hypothesis, more often pathological in controls than in BD patients. Nondiabetic and diabetic bipolar patients significantly differed in age, BMI, number of depressive episodes, and disease duration.
Discussion
When controlled for BMI, in our study there was no significantly increased rate of T2D in BD. We thus suggest that overweight and obesity might be mediating the association between BD and diabetes. Underlying causes could be shared risk genes, medication effects, and lifestyle factors associated with depressive episodes. As the latter two can be modified, attention should be paid to weight changes in BD by monitoring and taking adequate measures to prevent the alarming loss of life years in BD patients.
Variability of Thyroid Measurements from Ultrasound and Laboratory in a Repeated Measurements Study
(2020)
Background: Variability of measurements in medical research can be due to different sources. Quantification of measurement errors facilitates probabilistic sensitivity analyses in future research to minimize potential bias in epidemiological studies. We aimed to investigate the variation of thyroid-related outcomes derived from ultrasound (US) and laboratory analyses in a repeated measurements study. Subjects and Methods: Twenty-five volunteers (13 females, 12 males) aged 22–70 years were examined once a month over 1 year. US measurements included thyroid volume, goiter, and thyroid nodules. Laboratory measurements included urinary iodine concentrations and serum levels of thyroid-stimulating hormone (TSH), free triiodothyronine (fT3), free thyroxine (fT4), and thyroglobulin. Variations in continuous thyroid markers were assessed as coefficient of variation (CV) defined as mean of the individual CVs with bootstrapped confidence intervals and as intraclass correlation coefficients (ICCs). Variations in dichotomous thyroid markers were assessed by Cohen’s kappa. Results: CV was highest for urinary iodine concentrations (56.9%), followed by TSH (27.2%), thyroglobulin (18.2%), thyroid volume (10.5%), fT3 (8.1%), and fT4 (6.3%). The ICC was lowest for urinary iodine concentrations (0.42), followed by fT3 (0.55), TSH (0.64), fT4 (0.72), thyroid volume (0.87), and thyroglobulin (0.90). Cohen’s kappa values for the presence of goiter or thyroid nodules were 0.64 and 0.70, respectively. Conclusion: Our study provides measures of variation for thyroid outcomes, which can be used for probabilistic sensitivity analyses of epidemiological data. The low intraindividual variation of serum thyroglobulin in comparison to urinary iodine concentrations emphasizes the potential of thyroglobulin as marker for the iodine status of populations.
Copattern of depression and alcohol use in medical care patients: cross- sectional study in Germany
(2020)
Objective
To predict depressive symptom severity and presence of major depression along the full alcohol use continuum.
Design
Cross-sectional study.
Setting
Ambulatory practices and general hospitals from three sites in Germany.
Participants
Consecutive patients aged 18–64 years were proactively approached for an anonymous health screening (participation rate=87%, N=12 828). Four continuous alcohol use measures were derived from an expanded Alcohol Use Disorder Identification Test (AUDIT): alcohol consumption in grams per day and occasion, excessive consumption in days per months and the AUDIT sum score. Depressive symptoms were assessed for the worst 2-week period in the last 12 months using the Patient Health Questionnaire (PHQ-8). Negative binomial and logistic regression analyses were used to predict depressive symptom severity (PHQ-8 sum score) and presence of major depression (PHQ-8 sum score≥10) by the alcohol use measures.
Results
Analyses revealed that depressive symptom severity and presence of major depression were significantly predicted by all alcohol use measures after controlling for sociodemographics and health behaviours (p<0.05). The relationships were curvilinear: lowest depressive symptom severity and odds of major depression were found for alcohol consumptions of 1.1 g/day, 10.5 g/occasion, 1 excessive consumption day/month, and those with an AUDIT score of 2. Higher depressive symptom severity and odds of major depression were found for both abstinence from and higher levels of alcohol consumption. Interaction analyses revealed steeper risk increases in women and younger individuals for most alcohol use measures.
Conclusion
Findings indicate that alcohol use and depression in medical care patients are associated in a curvilinear manner and that moderation by gender and age is present.
Background: To reduce the burden of disease attributable to alcohol, screening for at-risk alcohol use in the general population is recommended. Screening is usually carried out at only one point in time although individual alcohol use may change over time and self-reported consumption may be biased by underreporting. However, there are gaps in research on temporal variability of alcohol use. Therefore, this cumulative dissertation investigated (1) changes in drinking patterns within 4 weeks; (2) changes in screening results within 12 months and factors predicting a transition from low-risk to at-risk alcohol use; (3) whether underreporting can be reduced by prompting respondents to recall their alcohol use in the past week prior to screening.
Methods: Participants were adults from the general population recruited in a municipal registry office. For the first paper, 288 alcohol users were assessed four times using Timeline Follow-Back, each one week apart. Changes in drinking patterns were analyzed using latent transition modeling. For the second paper, 831 control group participants of a randomized controlled trial were screened for at-risk alcohol use at baseline, 3, 6, and 12 months later using the Alcohol Use Disorders Identification Test - Consumption (AUDIT-C). The transition from low-risk to at-risk alcohol use was predicted using logistic regression. For the third paper, 2,379 alcohol users were screened for at-risk alcohol use using the AUDIT-C, either before or after receiving the prompt to recall their past week alcohol use. Data were analyzed using logistic regression.
Results: Within 4 weeks, 35 percent of alcohol users changed their drinking pattern. Changes were more likely for individuals with moderate or heavy compared to light drinking. Within 12 months, 30 percent of alcohol users changed their screening result. Changes were more likely for at-risk compared to low-risk alcohol users. Transitioning from low-risk to at-risk alcohol use was more likely for women (vs. men; Odds Ratio, OR = 1.66), 18- to 29-year-old adults (vs. 30- to 45-year-old adults; OR = 2.30), and individuals reporting two or more drinking days in the past week (vs. less than two; OR = 3.11). When respondents were prompted to recall their alcohol use in the past week prior to screening, they were less likely to report at-risk alcohol use compared to when the screening was conducted without prior prompt (OR = 0.83).
Conclusions: One in three alcohol users changed their consumption, some of them even within a period as short as 4 weeks. These changes might compromise the validity of screening that is commonly based on a single assessment of typical alcohol use. Furthermore, underreporting cannot be reduced by prompting individuals to recall their alcohol use in the past week prior to the screening for at-risk alcohol use. Rather, consecutive questionnaires addressing different aspects of alcohol use within a single survey might be a potential source of bias.
Frequency of biopsies after the disclosure of incidental findings from whole-body research MRI
(2021)
Large-scale, population-based cohort studies gather a range of data from participants over extended periods of time with the goal of providing researchers with information regarding the health status, prevalence of disease, and risk factors in a regional population. Examinations conducted in the context of population-based studies include imaging and laboratory testing and may yield abnormal results, also called incidental findings. According to predetermined disclosure policies, incidental findings may be disclosed to study participants. Evidence shows that the disclosure of incidental findings results in medical follow-up as research participants and their physicians seek to clarify the significance of findings.
This work examined the effect of disclosing incidental findings from whole-body MRI (wb-MRI) on the frequency and organ system of biopsies in participants in the Study of Health in Pomerania (SHIP), a population-based cohort study in Mecklenburg-West Pomerania. As most of the incidental wb-MRI findings involved unclear masses and lesions, we hypothesized that the disclosure of wb-MRI findings would lead to an increase in diagnostic biopsies. Based on current data showing that the outcomes of incidental imaging findings are frequently clinically irrelevant, we further hypothesized that an increase in biopsies would not translate to a clinically relevant increase in diagnoses of malignancies. We also took disclosed laboratory findings into account, as they were disclosed to all SHIP participants and may play a role in the decision to pursue a biopsy.
We found that the rate of biopsies increased after participation in SHIP and disclosure of incidental MRI and laboratory findings. Overall, most biopsies showed nonmalignant findings, indicating likely overdiagnosis and overtesting resulting from the disclosure of incidental findings in our cohort. However, subgroups of participants with disclosed MRI findings had a higher proportion of biopsies revealing premalignant or malignant diagnoses after SHIP, indicating that the applied decision rules for disclosure of MRI findings led to the identification of individuals with an elevated risk for premalignant or malignant diagnoses. The clinical relevance of these diagnoses is unclear and overdiagnosis cannot be ruled out.
In summary, we recommend more restrictive disclosure policies for incidental imaging findings in research to protect research participants from overtesting and to reduce bias. Further studies regarding the long-term morbidity and mortality of participants are needed to better understand the therapeutic impact of the disclosure of incidental wb-MRI findings in the research setting.
Due to demographic changes, medical and nursing care in Germany faces new challenges. Combined with the aging of the population, an increase in age-associated diseases, including dementia, is to be expected. In addition to the increase in the number of persons with certain age-specific diseases, the aging of the German population also results in an increase in the number of persons with multiple diseases. The coexistence of dementia and comorbidity in people with dementia creates complex challenges for ambulatory and clinical care. The existence of comorbidity also leads to significantly higher medical costs.
Implementing new collaborative care programs and redistributing the responsibilities among outpatient care providers in the ambulatory care of patients may be one approach to ensure and improve the life and care situation of people with dementia. Collaborative Dementia Care Management, with the concept of support of general practitioners by specific qualified nurses demonstrated an adequate and effective approach for the compensation of supply deficits of PwD in the primary care sector. The aim of the dissertation is the health economic analysis of comorbidities in dementia and the evaluated Dementia Care Management of the DelpHi-MV study as an innovative approach for care and treatment of comorbidities in people with dementia. It is assumed that the cost of care for PwD varies depending on comorbidity and socio-demographic and clinical characteristics. Therefore, the health care costs of people with dementia are calculated and the association between these care costs and comorbidity and socio-demographic and clinical factors of PwD was analyzed. In addition, we aimed to detect important subgroups (e.g. PwD with low, high or very high comorbidity) who benefit most from the DCM intervention and for whom a significant effect on costs, Quality-adjusted Life Years (QALY) and on the individual cost-effectiveness could be achieved, considering different sociodemographic and clinical characteristics like comorbidity.
In the sample of PwD comorbidity was highly prevalent. 47% of PwD had a very high, 37% a high and only 16% a low comorbidity in addition to dementia. The most prevalent co-existing comorbidity were diabetes mellitus (42%), peripheral vascular disease (28%) and cerebrovascular disease (25%). Total costs significantly increased by 528 € (SE=214, CI 95%=109-947, p=0.014) with each further comorbidity, especially due to significantly higher cost for medication and medical aids. Compared with a low comorbidity, a very high comorbidity was significantly associated with 818 € (SE=168, CI 95%= 489-1147, p<0.001) higher medication costs and 336 € (SE=161, CI 95%=20-652, p=0.037) higher cost for medical aids. There was no significant association between a higher comorbidity and cost for formal care services. The probability of DCM being cost-effective at a willingness-to-pay of 40,000€/QALY was higher especially in PwD having a high comorbidity (96% vs. 26% for patients with a low comorbidity), in females (96% vs. 16% for males), in those living alone (96% vs. 26% for those living not alone) and in those being moderately to severely cognitively (100% vs. 3% for patients without cognitive impairment) and functionally impaired (97% vs. 16% for patients without functional impairment).
Comorbidity in PwD represents a substantial financial burden on healthcare payer’s and is a challenge for patients, healthcare providers and the health system. Innovative approaches are needed to achieve a patient-oriented management of treatment and care in comorbid PwD to reduce long-term costs. Collaborative dementia care management is one approach to solve these problems in dementia care. Thereby, patients characteristics significantly affect the cost-effectiveness of collaborative care. Female patients, patients living alone, and those with a high comorbidity as well as those being moderately cognitively and functionally impaired benefit most from DCM. For those subgroups of patients, healthcare payers could gain the highest cost savings and the highest effects on QALYs when the DCM approach will be implemented.
Frontotemporal lobar degeneration (FTLD) is likely to be the second-most common cause of dementia in individuals under 65 years of age. Pathognomonic changes in personality, behavior and motivation are known to lead to high caregiver stress and burden, with little support being available. The aim of this work is to present the current state of knowledge on the characteristics, challenges and unmet needs of caregivers as well as on possible interventions.
Two scoping reviews on caregiver burden using the PRISMA checklist for scoping reviews were conducted using PubMed, Web of Science and ScienceDirect in April 2017 and November 2019, respectively. A total of 107 articles were considered eligible and were analyzed qualitatively and summarized.
Our results show that caregivers of patients with FTLD are often female, spouses of the PwD, younger in age, have underage children and provide care at home. Behavioral and motivational disturbances in the PwD are perceived to be the most burdensome aspects of caregiving. Those caring for an individual with the bvFTD subtype thus report higher levels of burden than caregivers of an individual with a form of PPA. With rising dementia severity, caregivers report higher levels of burden. Many caregivers experience a decline in their own physical and mental health as well as a significant financial burden resulting from care duties. The deterioration of the relationship between the PwD and their caregivers is a main burdensome aspect. Only few interventions were conducted so far, and none of those that were identified were designed as an RCT. The most efficacious interventions were those aimed directly at caregivers, whereas interventions aiming at the amelioration of symptoms in the PwD showed little effect.
Further research should reproduce and validate efficacious interventions and establish new interventional approaches. Another focus should be set on the situation of underage children of individuals with FTLD and relatives of a person with hereditary FTD. More research from non-Western countries is needed in order to identify culture-specific factors of caregiver burden. Along those lines, support structures for FTLD caregivers should be assessed on a local basis and extended accordingly. So far, no study has assessed the relationship between caregiver burden and possible consequences for the quality of care provided to the PwD in FTLD specifically. Awareness both in the wider population and among healthcare professionals is an urgent need for the future since FTLD is often misdiagnosed, leading to a delay in obtaining the correct diagnosis and access to suitable support.
(1) Background: Predicting chronic low back pain (LBP) is of clinical and economic interest as LBP leads to disabilities and health service utilization. This study aims to build a competitive and interpretable prediction model; (2) Methods: We used clinical and claims data of 3837 participants of a population-based cohort study to predict future LBP consultations (ICD-10: M40.XX-M54.XX). Best subset selection (BSS) was applied in repeated random samples of training data (75% of data); scoring rules were used to identify the best subset of predictors. The rediction accuracy of BSS was compared to randomforest and support vector machines (SVM) in the validation data (25% of data); (3) Results: The best subset comprised 16 out of 32 predictors. Previous occurrence of LBP increased the odds for future LBP consultations (odds ratio (OR) 6.91 [5.05; 9.45]), while concomitant diseases reduced the odds (1 vs. 0, OR: 0.74 [0.57; 0.98], >1 vs. 0: 0.37 [0.21; 0.67]). The area-under-curve (AUC) of BSS was acceptable (0.78 [0.74; 0.82]) and comparable with SVM (0.78 [0.74; 0.82]) and randomforest (0.79 [0.75; 0.83]); (4) Conclusions: Regarding prediction accuracy, BSS has been considered competitive with established machine-learning approaches. Nonetheless, considerable misclassification is inherent and further refinements are required to improve predictions.
Abstract
Background
Opioid use for chronic non‐cancer pain (CNCP) is under debate. In the absence of pan‐European guidance on this issue, a position paper was commissioned by the European Pain Federation (EFIC).
Methods
The clinical practice recommendations were developed by eight scientific societies and one patient self‐help organization under the coordination of EFIC. A systematic literature search in MEDLINE (up until January 2020) was performed. Two categories of guidance are given: Evidence‐based recommendations (supported by evidence from systematic reviews of randomized controlled trials or of observational studies) and Good Clinical Practice (GCP) statements (supported either by indirect evidence or by case‐series, case–control studies and clinical experience). The GRADE system was applied to move from evidence to recommendations. The recommendations and GCP statements were developed by a multiprofessional task force (including nursing, service users, physicians, physiotherapy and psychology) and formal multistep procedures to reach a set of consensus recommendations. The clinical practice recommendations were reviewed by five external reviewers from North America and Europe and were also posted for public comment.
Results
The European Clinical Practice Recommendations give guidance for combination with other medications, the management of frequent (e.g. nausea, constipation) and rare (e.g. hyperalgesia) side effects, for special clinical populations (e.g. children and adolescents, pregnancy) and for special situations (e.g. liver cirrhosis).
Conclusion
If a trial with opioids for chronic noncancer pain is conducted, detailed knowledge and experience are needed to adapt the opioid treatment to a special patient group and/or clinical situation and to manage side effects effectively.
Significance
If a trial with opioids for chronic noncancer pain is conducted, detailed knowledge and experience are needed to adapt the opioid treatment to a special patient group and/or clinical situation and to manage side effects effectively. A collaboration of medical specialties and of all health care professionals is needed for some special populations and clinical situations.
CFTR encodes for a chloride and bicarbonate channel expressed at the apical membrane of polarized epithelial cells. Transepithelial sodium transport mediated by the amiloride-sensitive sodium channel ENaC is thought to contribute to the manifestation of CF disease. Thus, ENaC is a therapeutic target in CF and a valid cystic fibrosis modifier gene. We have characterized SCNN1B as a genetic modifier in the three independent patient cohorts of F508del-CFTR homozygotes. We could identify a regulatory element at SCNN1B to the genomic segment rs168748-rs2303153-rs4968000 by fine-mapping (Pbest = 0.0177), consistently observing the risk allele rs2303153-C and the contrasting benign allele rs2303153-G in all three patient cohorts. Furthermore, our results show that expression levels of SCNN1B are associated with rs2303153 genotype in intestinal epithelia (P = 0.003). Our data confirm that the well-established biological role of SCNN1B can be recognized by an association study on informative endophenotypes in the rare disease cystic fibrosis and calls attention to reproducible results in association studies obtained from small, albeit carefully characterized patient populations.
Objectives: An inverse relationship between education and cardiovascular risk has been described, however, the combined association of education, income, and neighborhood socioeconomic status with macrovascular disease is less clear. The aim of this study was to evaluate the association of educational level, equivalent household income and area deprivation with macrovascular disease in Germany.
Methods: Cross-sectional data from two representative German population-based studies, SHIP-TREND (n = 3,731) and KORA-F4 (n = 2,870), were analyzed. Multivariable logistic regression models were applied to estimate odds ratios and 95% confidence intervals for the association between socioeconomic determinants and macrovascular disease (defined as self-reported myocardial infarction or stroke).
Results: The study showed a higher odds of prevalent macrovascular disease in men with low and middle educational level compared to men with high education. Area deprivation and equivalent income were not related to myocardial infarction or stroke in any of the models.
Conclusion: Educational level, but not income or area deprivation, is significantly related to the macrovascular disease in men. Effective prevention of macrovascular disease should therefore start with investing in individual education.
The Study of Health in Pomerania (SHIP), a population-based study from a rural state in northeastern Germany with a relatively poor life expectancy, supplemented its comprehensive examination program in 2008 with whole-body MR imaging at 1.5 T (SHIP-MR). We reviewed more than 100 publications that used the SHIP-MR data and analyzed which sequences already produced fruitful scientific outputs and which manuscripts have been referenced frequently. Upon reviewing the publications about imaging sequences, those that used T1-weighted structured imaging of the brain and a gradient-echo sequence for R2* mapping obtained the highest scientific output; regarding specific body parts examined, most scientific publications focused on MR sequences involving the brain and the (upper) abdomen. We conclude that population-based MR imaging in cohort studies should define more precise goals when allocating imaging time. In addition, quality control measures might include recording the number and impact of published work, preferably on a bi-annual basis and starting 2 years after initiation of the study. Structured teaching courses may enhance the desired output in areas that appear underrepresented.
Background
Vulnerable groups, e.g. persons with mental illness, neurological deficits or dementia, are often excluded as participants from research projects because obtaining informed consent can be difficult and tedious. This may have the consequence that vulnerable groups benefit less from medical progress. Vulnerable persons are often supported by a legal guardian in one or more demands of their daily life. We examined the attitudes of legal guardians and legally supervised persons towards medical research and the conditions and motivations to participate in studies.
Methods
We conducted a cross-sectional study with standardized surveys of legal guardians and legally supervised persons. Two separate questionnaires were developed for the legal guardians and the supervised persons to asses previous experiences with research projects and the reasons for participation or non-participation. The legal guardians were recruited through various guardianship organizations. The supervised persons were recruited through their legal guardian and from a previous study among psychiatric patients. The data were analysed descriptively.
Results
Alltogether, 82 legal guardians and 20 legally supervised persons could be recruited. Thereof 13 legal guardians (15.6%) and 13 legally supervised persons (65.0%) had previous experience with research projects. The majority of the guardians with experience in research projects had consented the participation of their supervised persons (n = 12 guardians, 60.0%; in total n = 16 approvals). The possible burden on the participating person was given as the most frequent reason not to participate both by the guardians (n = 44, 54.4%) and by the supervised persons (n = 3, 30.0%). The most frequent motivation to provide consent to participate in a research study was the desire to help other patients by gaining new scientific knowledge (guardians: n = 125, 78.1%; supervised persons: n = 10, 66.6%).
Conclusions
Overall, an open attitude towards medical research can be observed both among legal guardians and supervised persons. Perceived risks and no sense recognized in the study are reasons for not participating in medical research projects.
Introduction
Stroke is the leading neurological cause of adult long-term disability in Europe. Even though functional consequences directly related to neurological impairment are well studied, post-stroke trajectories of functional health according to the International Classification of Functioning, Disability and Health are poorly understood. Particularly, no study investigated the relationship between post-stroke trajectories of activities of daily living (ADL) and self-rated health (SRH). However, such knowledge is of major importance to identify patients at risk of unfavourable courses. This prospective observational study aims to investigate trajectories of ADL and SRH, and their modifying factors in the course of the first year after stroke.
Methods and analysis
The study will consecutively enrol 300 patients admitted to a tertiary care hospital with acute ischaemic stroke or transient ischaemic attack (TIA; Age, Blood Pressure, Clinical Features, Duration of symptoms, Diabetes score ≥3). Patient inclusion is planned from May 2021 to September 2022. All participants will complete an interview assessing ADL, SRH, mental health, views on ageing and resilience-related concepts. Participants will be interviewed face-to-face 1–5 days post-stroke/TIA in the hospital; and will be followed up after 6 weeks, 3 months, 6 months and 12 months via telephone. The 12-month follow-up will also include a neurological assessment. Primary endpoints are ADL operationalised by modified Rankin Scale scores and SRH. Secondary outcomes are further measures of ADL, functional health, physical activity, falls and fatigue. Views on ageing, social support, resilience-related concepts, affect, frailty, illness perceptions and loneliness will be examined as modifying factors. Analyses will investigate the bidirectional relationship between SRH and ADL using bivariate latent change score models.
Ethics and dissemination
The study has been approved by the institutional review board of the University Medicine Greifswald (Ref. BB 237/20). The results will be disseminated through scientific publications, conferences and media. Moreover, study results and potential implications will be discussed with patient representatives.
Trial registration number NCT04704635.
Introduction: With the increased emergence of SARS-CoV-2 variants, the impact on schools and preschools remains a matter of debate. To ensure that schools and preschools are kept open safely, the identification of factors influencing the extent of outbreaks is of importance.
Aim: To monitor dynamics of COVID-19 infections in schools and preschools and identify factors influencing the extent of outbreaks.
Methods: In this prospective observational study we analyzed routine surveillance data of Mecklenburg-Western Pomerania, Germany, from calendar week (CW) 32, 2020 to CW19, 2021 regarding SARS-CoV-2 infection events in schools and preschools considering changes in infection control measures over time. A multivariate linear regression model was fitted to evaluate factors influencing the number of students, teachers and staff tested positive following index cases in schools and preschools. Due to an existing multicollinearity in the common multivariate regression model between the variables “face mask obligation for children” and “face mask obligation for adults”, two further separate regression models were set up (Multivariate Model Adults and Multivariate Model Children).
Results: We observed a significant increase in secondary cases in preschools in the first quarter of 2021 (CW8 to CW15, 2021), and simultaneously a decrease in secondary cases in schools. In multivariate regression analysis, the strongest predictor of the extent of the outbreaks was the teacher/ caregiver mask obligation (B = −1.9; 95% CI: −2.9 to −1.0; p < 0.001). Furthermore, adult index cases (adult only or child+adult combinations) increased the likelihood of secondary cases (B = 1.3; 95% CI: 0.9 to 1.8; p < 0.001). The face mask obligation for children also showed a significant reduction in the number of secondary cases (B = −0.6; 95% CI: −0.9 to −0.2; p = 0.004.
Conclusion: The present study indicates that outbreak events at schools and preschools are effectively contained by an obligation for adults and children to wear face masks.
Quality of life (QoL) is a core patient-reported outcome in healthcare research, alongside primary clinical outcomes. A conceptual, operational, and psychometric elaboration of QoL in the context of TM is needed, because standardized instruments to assess QoL do not sufficiently represent essential aspects of intended outcomes of telemedical applications (TM). The overall aim is to develop an instrument that can adequately capture QoL in TM. For that purpose, an extended working model of QoL will be derived. Subsequently, an instrument will be developed and validated that captures those aspects of QoL that are influenced by TM. The initial exploratory study section includes (a) a systematic literature review, (b) a qualitative survey for concept elicitation, and (c) pre-testings using cognitive debriefings with patients and an expert workshop. The second quantitative section consists of an online expert survey and two patient surveys for piloting and validation of the newly developed instrument. The resulting questionnaire will assess central experiences of patients regarding telemedical applications and its impact on QoL more sensitively. Its use as adjunct instrument will lead to a more appropriate evaluation of TM and contribute to the improvement of care tailored to patients’ individual needs.
Literature shows that people with a migration background (PwM) with dementia are an especially vulnerable group. Data on the number of PwM with dementia in Germany is scarce meaning the healthcare system faces a challenge of an unknown magnitude. They are mostly not part of the healthcare landscape and lack knowledge about dementia and healthcare services. Healthcare professionals and services do not seem to be culturally sensitive enough and not adequately equipped to take care of PwM with dementia. Therefore, this work focuses on a) estimating the number of PwM with dementia broken down by country of origin and federal state; b) exploring the caregiving experience, barriers of healthcare utilisation and measures to increase utilisation; and c) determining the scope of culturally sensitive information and healthcare services as well as projects on dementia and migration in Germany. A combination of quantitative and qualitative research methods as well as a scoping review are applied to examine the research focus.
Calculations show that an estimated 96,500 PwM have dementia, presumably mostly originating from Poland, Italy, Turkey, Romania, and the Russian Federation. The majority of affected PwM live in North Rhine-Westphalia, Baden-Württemberg, and Bavaria. Family members experience similar challenges and consequences as non-migrants in the care of a person with dementia. PwM lack sufficient knowledge of dementia and information regarding the available healthcare services. These are only two of the reasons why the healthcare system is not utilised. To increase utilisation, services should be culturally sensitive and information easily accessible. In addition, easier navigation and the expansion of existing healthcare structures is needed. The scoping review identified 48 culturally sensitive healthcare and information services and projects for PwM with dementia. The majority are located in North Rhine-Westphalia, Baden-Württemberg, Bavaria, and Hesse, which mirrors the distribution of PwM with dementia in Germany. For the most part, these services offer counselling in different languages. These results confirm that PwM (with dementia) and healthcare professionals need in-depth education on this topic. There should be a focus on the design of information and healthcare services that are tailored in a culturally sensitive way. This dissertation further indicates that culturally sensitive healthcare services, personalised for individual situations on site, should be expanded and also facilitated by not only healthcare professionals and service providers but also by law- and decision-makers. Furthermore, there is a need for cooperation between researchers, healthcare professionals, service providers, healthcare systems, law-makers, and other stakeholders in the field on a national and an international level.
Background: A large body of research indicates that the cognitions individuals have
about their own age and aging, so called self-perceptions of aging (SPA), predict health and
wellbeing in later life. However, much less is known about associations of SPA with
developmental correlates such as personality. Some initial studies have found cross-sectional
and longitudinal associations of the Big Five traits (openness to experience,
conscientiousness, extraversion, agreeableness, and neuroticism) with SPA. Building on these
findings, this thesis aimed at advancing knowledge on associations of personality with SPA.
To this end, cross-sectional associations of the meta-traits of agency, i.e., a focus on the self,
and communion, i.e., a focus on others, with SPA were examined in study 1, and longitudinal
associations of agentic and communal personal values with SPA were examined in study 2.
Study 3 aimed at expanding findings of previous studies on associations of SPA with selfreported
physical function to an objective indicator of physical function, namely, gait pattern.
In all studies, SPA were treated as a multidimensional construct comprising gains and losses.
Methods: Study 1 was based on data of 154 adults aged 75 and older that were
recruited in hospital. Data was collected one month after recruitment. In regression analyses,
associations of agentic and communal traits with SPA beyond health were examined. Study 2
was based on data of 6,089 adults aged 40 and older enrolled in the German Ageing Survey
(DEAS). Multiple regression analyses were used to test whether personal value priority
predicted change in SPA over three years beyond age stereotypes. For study 3, latent profile
analysis was employed to detect gait patterns based on data of 150 adults aged 70 and older
collected via an automated walkway at participants’ regular speed and individual maximum
speed. In a next step, associations of SPA with gait patterns beyond personality traits were
investigated in binary logistic regressions.
Results: Agentic and communal personality traits were associated with gain-, but not
loss-related SPA when controlling for health (study 1). In study 2, the value priority of
openness to change (self-direction, stimulation) predicted more gain-related SPA three years
later, while the value priority of conservation (tradition, security) was negatively associated
with gain-related SPA. The value priority of self-enhancement (achievement, power) was
associated with more loss-related SPA three years later. Finally, the value priority of selftranscendence
(universalism, benevolence), i.e. a concern for the well-being of others, was
associated with more gain- and less loss-related SPA at follow-up. In study 3, latent profile
analyses distinguished two groups with different gait patterns in both gait speed conditions.
One group exhibited a slower and less well-coordinated gait pattern, which reflected
functional limitations. The other group exhibited a faster and well-coordinated gait pattern,
which reflected better physical function. More loss-, but not gain-related SPA were associated
with higher likelihood to exhibit a functionally limited gait pattern at regular speed.
Conversely, gain- but not loss-related SPA were associated with higher likelihood to exhibit a
fit gait pattern at individual maximum speed.
Conclusion: Results of this thesis have three main implications for research on SPA.
First, agency and communion may constitute useful dimensions for further investigating SPA
domains, as both were associated with SPA in study 1. Second, findings of study 2 point to
the role of motivation for SPA that needs to be further explored. Third, findings of study 3
indicate that SPA are not only associated with self-reported, but also objectively measured
physical function, which stresses the importance of SPA for health in later life. As a practical
implication, the findings presented here suggest that interventions on SPA should consider
participants’ personality, both on the level of traits and values.