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Background  Reaching recruitment targets in randomised controlled trials is a challenge. Media tools are increasingly used to engage participants, yet there is a paucity of research into the use of video to optimise recruitment. We therefore tested whether adding a participant information video clip to a standard participant information sheet improved recruitment into a parenting trial.    Methods  One hundred seven participants were randomised to receive either a participant information sheet ( n  = 51) or an informational video clip ( n  = 56) as part of an email contact following a screening phase. All participants went on to receive the information sheet as part of the existing consent procedure.    Results  The video condition did not increase the odds of recruitment into the trial, such that those in the video condition were significantly less likely to participate in the main trial (OR = 0.253, CI = 0.104–0.618,  p  = 0.003).    Conclusion  The introduction of a video clip into the recruitment stages of a parenting trial did not lead to an improvement in recruitment; however, the small sample size precludes definitive inferences. We offer reflections on challenges encountered in implementing the SWAT and suggestions for other researchers seeking to embed recruitment SWATs into similar trials.    Trial registration  Current controlled trials  ISRCTN 58327365 . Registered on 19 March 2015.    SWAT registration  SWAT 106; Effects of a video clip on recruitment into a randomised trial. Registered on 20 December 2016.

Does a video clip enhance recruitment into a parenting trial? Learnings from a study within a trial