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01.06.2014 | Original Article | Ausgabe 3/2014

International Journal of Public Health 3/2014

Response in individuals with and without foreign background and application to the National Cohort in Germany: which factors have an effect?

Zeitschrift:
International Journal of Public Health > Ausgabe 3/2014
Autoren:
Volker Winkler, Michael Leitzmann, Nadia Obi, Wolfgang Ahrens, Thomas Edinger, Guido Giani, Jakob Linseisen, Markus Löffler, Karin Michels, Ute Nöthlings, Sabine Schipf, Alexander Kluttig, H.-Erich Wichmann, Barbara Hoffmann, Karl-Heinz Jöckel, Heiko Becher

Abstract

Objectives

Response rates in epidemiologic studies vary widely. This study examines response rates of potential study participants according to foreign versus German background and investigates effects of recruitment strategies.

Methods

Response rates and characteristics of recruitment procedures from feasibility studies for a large cohort study conducted in 2011 were analyzed.

Results

Among 1,235 participants the proportion of recruited individuals with a foreign background was 17.3 % (95 % confidence interval 15.3–19.5 %), significantly lower than in the sampling frame (23.1 %). The difference between observed and expected proportion was high among individuals with Turkish background and smaller among ethnic Germans from the Former Soviet Union and other foreign background groups. Common recruitment strategies to increase the response had positive effects in all groups. For the planned recruitment strategy in the forthcoming German National Cohort, we estimate an overall response of approximately 50 %.

Conclusions

Individuals with Turkish background may need particular efforts to be adequately represented in a population-based cohort in Germany. Other foreign background groups are relatively well represented using standard procedures. An adequate response can be obtained under carefully planned recruitment strategies.

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