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Volkert, Jana; Härter, Martin; Dehoust, Maria Christina; Schulz, Holger; Sehner, Susanne; Suling, Anna; Wegscheider, Karl; Ausin, Berta; Canuto, Alessandra; Crawford, Mike J.; Ronch, Chiara da; Grassi, Luigi; Hershkovitz, Yael; Munoz, Manuel; Quirk, Alan; Rotenstein, Ora; Belen Santos-Olmo, Ana; Shalev, Arieh Y.; Strehle, Jens; Weber, Kerstin; Wittchen, Hans-Ulrich; Andreas, Sylke (2017): Study approach and field work procedures of the MentDis_ ICF65+project on the prevalence of mental disorders in the older adult European population. In: BMC Psychiatry 17:366
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Abstract

Background: This study describes the study approach and field procedures of the MentDis_ICF65+ study, which aims to assess the prevalence of mental disorders in older adults. Methods: An age-appropriate version of the Composite International Diagnostic Interview (CIDI65+) was developed and tested with regard to its feasibility and psychometric properties in a pre-test and pilot phase. In the cross-sectional survey an age-stratified, random sample of older adults (65-84 years) living in selected catchment areas of five European countries and Israel was recruited. Results: N = 3142 participants (mean age 73.7 years, 50.7% female) took part in face-to-face interviews. The mean response rate was 20% and varied significantly between centres, age and gender groups. Sociodemographic differences between the study centres appeared for the place of birth, number of grandchildren, close significants, retirement and self-rated financial situation. The comparison of the MentDis_ICF65+ sample with the catchment area and country population of the study centres revealed significant differences, although most of these were numerically small. Conclusions: The study will generate new information on the prevalence of common mental disorders among older adults across Europe using an age-appropriate, standardized diagnostic instrument and a harmonized approach to sampling. Generalizability of the findings and a potentially limited representativeness are discussed.