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Does the time at which a participant incentive is given affect the retention rate?

SWAT: 90

Objective of this SWAT:

To compare the effects on retention rates of giving trial participants a £20 gift voucher at the recruitment visit versus when they have returned their trial diary


In Progress


Please click the links below to access the registered protocol or SWAT download bundle which includes: 1) SWHSI Initial Results Publication
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