BMJ open
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Review Meta Analysis
Strategies to improve retention in randomised trials: a Cochrane systematic review and meta-analysis.
To quantify the effect of strategies to improve retention in randomised trials. ⋯ Most of the trials evaluated questionnaire response rather than ways to improve participants return to site for follow-up. Monetary incentives and offers of monetary incentives increase postal and electronic questionnaire response. Some strategies need further evaluation. Application of these results would depend on trial context and follow-up procedures.
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Review Meta Analysis
Strategies to improve retention in randomised trials: a Cochrane systematic review and meta-analysis.
To quantify the effect of strategies to improve retention in randomised trials. ⋯ Most of the trials evaluated questionnaire response rather than ways to improve participants return to site for follow-up. Monetary incentives and offers of monetary incentives increase postal and electronic questionnaire response. Some strategies need further evaluation. Application of these results would depend on trial context and follow-up procedures.