What question did this study set out to answer?

This trial aims to identify factors that enhance response rates to mailed questionnaires in epidemiologic studies.

Controlled Trial of the Effect of Length, Incentives, and Follow-up Techniques on Response to a Mailed Questionnaire

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Controlled trial examines factors influencing response rates to mailed questionnaires in volunteers, suggesting effective techniques.

This trial aims to identify factors that enhance response rates to mailed questionnaires in epidemiologic studies.
Conducted controlled trial on volunteers from a blood specimen bank.
Tested variations in questionnaire length, monetary incentives, and follow-up reminders.
Compared response rates between a second mailing and postcard reminders.
Response rates were similar for short (16-item) and long (76-item) questionnaires.
Monetary incentives did not significantly enhance responses.
A second mailing improved responses compared to postcard reminders (23% vs. 10%).

Hoffman et al. (1998) studied this question.

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