OBJECTIVE: To identify methods to increase response to postal questionnaires. DESIGN: Systematic review of randomised controlled trials of any method to influence response to postal questionnaires. STUDIES REVIEWED: 292 randomised controlled trials including 258 315 participants INTERVENTION REVIEWED: 75 strategies for influencing response to postal questionnaires. MAIN OUTCOME MEASURE: The proportion of completed or partially completed questionnaires returned. RESULTS: The odds of response ...Expand abstract
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Increasing response rates to postal questionnaires: systematic review.
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