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Control response proportions in population-based case-control studies in Germany.

A Stang¹, W Ahrens, K H Jöckel

¹Institute of Medical Informatics, Biometry and Epidemiology, Medical Faculty, University of Essen, Germany.

Epidemiology (Cambridge, Mass.)

|March 9, 1999

Summary

Population-based case-control studies in Germany achieved 80% case response and 68% control response. Telephone access significantly impacted control participation, highlighting the need for improved recruitment strategies.

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Area of Science:

Epidemiology
Public Health Research Methods

Background:

Population-based case-control studies are crucial for epidemiological research.
Assessing response rates and recruitment methods is vital for study validity.

Purpose of the Study:

To investigate recruitment methods, response levels, and determinants in German population-based case-control studies.
To evaluate response proportion calculation methods and propose a new efficacy measure.

Main Methods:

Systematic review and pooled analysis of 26 eligible population-based case-control studies from Germany.
Analysis of response proportions among cases and controls, and factors influencing response.

Main Results:

The pooled response proportion was 80% for cases and 68% for controls.

Related Experiment Videos

Controls without telephones showed approximately 50% lower response rates compared to those with telephones.

Identified key determinants affecting participation in these studies.

Conclusions:

Response rates in German case-control studies are generally high, but with disparities.
Telephone access is a significant factor influencing control participation.
A novel measure is proposed to better assess the effectiveness of recruitment strategies.