Archive for "April 2019"

Effects of a sequential mixed-mode design on participation, contact and sample composition – Results of the pilot study “IMOA – Improving Health Monitoring in Old Age”

Beate Gaertner*, Robert Koch Institute (RKI), Berlin, Germany
Denise Lüdtke*, Robert Koch Institute (RKI), Berlin, Germany
Carmen Koschollek, Robert Koch Institute (RKI), Berlin, Germany
Maike M Grube, Robert Koch Institute (RKI), Berlin, Germany
Jens Baumert, Robert Koch Institute (RKI), Berlin, Germany
Christa Scheidt-Nave, Robert Koch Institute (RKI), Berlin, Germany
Antje Gößwald, Robert Koch Institute (RKI), Berlin, Germany
Judith Fuchs, Robert Koch Institute (RKI), Berlin, Germany
Matthias Wetzstein, Robert Koch Institute (RKI), Berlin, Germany
*shared first authorship


Existing health survey data of individuals who are 65+ years of age is limited due to the exclusion of the oldest old and physically or cognitively impaired individuals. This study aimed to assess the effects of a sequential mixed-mode design on (1) contact and response rates, (2) sample composition and (3) non-response bias. A register-based random sample of 2,000 individuals 65+ years was initially contacted by mail to answer a health questionnaire. Random subgroups of initial non-responders were further contacted by telephone or home visits. Participation by interview or proxy was possible. After postal contact only, the initial contact and …

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