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Main sample: 3080 (3600 expected). Oversample: 991 immigrants. Three questionnaires were used: self-administered questionnaire, face-to-face questionnaire (CAPI) and life calendar. The face-to-face questionnaire was conducted by a specially trained interviewer. The interviews with 100 close relatives (project "linked lives") couldn't be conducted.
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The main sample was randomly selected in the cantonal population records, and stratified by age (65 - 69; 70 - 74; 75 - 79; 80 - 84; 85 - 89; 90 and above) and sex, for a total of about 600 respondents in each canton, either community dwelling or living in nursing homes. Response rate: 33%.
Self-administered questionnaire
Life calendar
