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Methods A two-arm RCT was embedded into the follow-up of older adults as part of the UK Casper Plus trial and Casper Cohort. At 4 months follow-up, participants were randomised to receive either a questionnaire or a questionnaire + post-it note requesting completion. Logistic regression and time-to-event analyses were used to assess attrition. Results were combined with those of a previous embedded RCT (ATLAS) in a meta-analysis.

Post-it notes to improve questionnaire response rates in RCTs - findings from a randomised sub-study