The effectiveness of a contingent financial incentive to improve trial follow up; a randomised study within a trial (SWAT).

ABSTRACT: Objectives To evaluate the effectiveness of a contingent financial incentive (£10 note in addition to a routinely provided £10 voucher) versus no contingent financial incentive, on improving the retention rate in a randomised controlled trial (RCT). Methods A two arm 'Study within a Trial' (SWAT) embedded within a host RCT (SCIMITAR+). Participants were randomised to the SWAT using a 2:1 (intervention:control) allocation ratio. The primary outcome measure was the proportion of participants completing a CO breath measurement at the first SCIMITAR+ follow up time point (6 months). Secondary outcomes were withdrawing from follow-up after contact and time from assessment due date to completion.  Analyses were conducted using logistic or Cox Proportional Hazards regression as appr

SUBMITTER: Arundel C 

PROVIDER: S-EPMC7372525 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature