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

Research output: Contribution to journalArticle


Open Access Status

  • Embargoed (until 22/07/20)


Ben Young, Laura Bedford, Roshan das Nair, Stephanie Gallant, Roberta Littleford, John F.R. Robertson, Stuart Schembri, Frank M. Sullivan, Kavita Vedhara, Denise Kendrick, ECLS study team

School/Research organisations


Rationale, aims, and objectives:  High response rates to research questionnaires can help to ensure results are more representative of the population studied and provide increased statistical power, on which the study may have been predicated. Improving speed and quality of response can reduce costs.

Method:  We conducted a randomized study within a trial (SWAT) to assess questionnaire response rates, reminders sent, and data completeness with unconditional compared with conditional monetary incentives. Eligible individuals were mailed a series of psychological questionnaires as a follow‐up to a baseline host trial questionnaire. Half received a £5 gift voucher with questionnaires (unconditional), and half were promised the voucher after returning questionnaires (conditional).

Results:  Of 1079 individuals, response rates to the first follow‐up questionnaire were 94.2% and 91.7% in the unconditional and conditional monetary incentive groups, respectively (OR 1.78; 95% CI, 0.85‐3.72). There were significantly greater odds of returning repeat questionnaires in the unconditional group at 6 months (OR 2.97; 95% CI, 1.01‐8.71; .047) but not at 12 months (OR 1.12; 95% CI, 0.44‐2.85). Incentive condition had no impact at any time point on the proportion of sent questionnaires that needed reminders. Odds of incomplete questionnaires were significantly greater at 3 months in the unconditional compared with the conditional incentive group (OR 2.45; 95% CI, 1.32‐4.55; .004).

Conclusions:  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.


Original languageEnglish
JournalJournal of Evaluation in Clinical Practice
VolumeEarly View
Early online date22 Jul 2019
Publication statusE-pub ahead of print - 22 Jul 2019

    Research areas

  • Questionnaires, Response rates, Recruitment strategies, Monetary incentives, Clinical trial, Randomized, SWAT

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