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Unconditional and conditional monetary incentives to increase response to mailed questionnaires: A randomized controlled study within a trial (SWAT).

Ben YoungLaura BedfordRoshan das NairStephanie GallantRoberta LittlefordJohn F R RobertsonStuart SchembriFrank M SullivanKavita VedharaDenise Kendricknull null
Published in: Journal of evaluation in clinical practice (2019)
Unconditional monetary incentives can produce a transitory greater likelihood of mailed questionnaire response in a clinical trial participant group, consistent with the direction of effect in other settings. However, this could have been a chance finding. The use of multiple strategies to promote response may have created a ceiling effect. This strategy has potential to reduce administrative and postage costs, weighed against the cost of incentives used, but could risk compromising the completeness of data.
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