Journal of epidemiology and community health
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J Epidemiol Community Health · Nov 2005
Review Meta AnalysisMeta-analysis of randomised trials of monetary incentives and response to mailed questionnaires.
To quantify the increase in mailed questionnaire response attributable to a monetary incentive. ⋯ This meta-analysis of the best available evidence shows that monetary incentives increase mailed questionnaire response. Researchers should include small amounts of money with mailed questionnaires rather than give no incentive at all.