In epidemiological investigations, one common but rarely analyzed threat to generalizability is sample selectivity or nonrandom sample attrition. In this chapter, we describe our approach to the study of selectivity and provide indepth analyses of the magnitude of sample selectivify in the Berlin Aging Study. Of all individuals eligible for participation (the verified parent sample, N = 1,908), 27Vo reached the highest level of participation (the Intensive Protocol, N = 516). \4/ith respect to levels of performance, projection of selectivity observed on lower levels ofparticipation onto Intensive Protocol constructs indicates that the Intensive Protocol sample was, indeed, positively selected on medical, social, and psychological dimensions. However, the magnitude of observed selectivity effects did not exceed 0.5 standard deviations for any construct. In addition, variances and covariance relations observed in the Intensive Protocol sample were not markediy different from those found at lower levels of participation. We conclude that the degree of selectivity in BASE fell within the usual range and did not result in a decrease of sample heterogeneity. Given the magnitude of sample attrition and the high mean age of the sample, this is a satisfactory result.
The German federal states initiated the "Pathological Gambling and Epidemiology" (PAGE) program to evaluate the public health relevance of pathological gambling. The aim of PAGE was to estimate the prevalence of pathological gambling and cover the heterogenic presentation in the population with respect to comorbid substance use and mental disorders, risk and protective factors, course aspects, treatment utilization, triggering and maintenance factors of remission, and biological markers. This paper describes the methodological details of the study and reports basic prevalence data. Two sampling frames (landline and mobile telephone numbers) were used to generate a random sample from the general population consisting of 15,023 individuals (ages 14 to 64) completing a telephone interview. Additionally, high-risk populations have been approached in gambling locations, via media announcements, outpatient addiction services, debt counselors, probation assistants, self-help groups and specialized inpatient treatment facilities. The assessment included two steps: (1) a diagnostic interview comprising the gambling section of the Composite International Diagnostic Interview (CIDI) for case finding; (2) an in-depth clinical interview with participants reporting gambling problems. The in-depth clinical interview was completed by 594 participants, who were recruited from the general or high-risk populations. The program provides a rich epidemiological database which is available as a scientific use file.
The purpose of this paper is to predict health care utilization in the very old from a combination of individual-based factors such as physical and mental health, health attitudes and beliefs, sociodemographic characteristics, and life circumstances. This study was conducted within the context of the Berlin Aging Study (BASE). Higher use of medications was most strongly predicted by more medical diagnoses, better cognitive status, and health attitudes. Physician contact was only weakly predicted by physical health variables, hypochondriasis, and living alone. In contrast, living alone was the greatest predictor of the utilization of increased levels of caregiving services, while having children nearby served as a protective factor against the need for more formal caregiving services. These results show that utilization of health care depends on interaction between physical and mental health, attitudinal, and social factors.
The purpose of this study was to determine prevalence rates of psychiatric morbidity in the elderly, distinguishing different levels of psychiatric caseness as compared to the diagnoses of the DSM-III-R. In a cross-sectional population-based study in Berlin (West), Germany, 516 people aged 70 to 95+ were randomly selected from the obligatory city registry (1990-1993) and stratified by age and gender (N = 43 men and N = 43 women in each of six 5-year age groups). Psychiatric and physical examinations were carried out in an extensive standardized assessment. Distinct psychopathological syndromes occurred in 72.7% of the elderly (54.6% of the men, 79.1% of the women). A clinically defined psychiatric disorder was found in 49.4% of the elderly (95% confidence interval 43.9%- 54.9%; 36.4% of the men, 54.0% of the women). Excluding insomnia, the overall psychiatric morbidity was 40.4% (30.9% m, 43.8% w). Excluding clinical diagnoses that were not otherwise specified in the DSM-III-R, the overall prevalence of specified DSM-III-R diagnoses was 23.5% (16.3% m, 26.0% w). Excluding dementia, which is known to be age-related, the prevalence was 11.3% (8.5% m, 12.2% w) and no significant effect between the age groups was seen. A considerable proportion of clinically relevant psychiatric morbidity in the elderly does not meet the criteria of specified DSM-III-R diagnoses, although these cases are in need of care. The data show that the threshold and severity of caseness accounts for important differences when overall psychiatric morbidity is assessed.
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