A comparison of small monetary incentives to convert survey non-respondents: A randomized control trial

Joan M. Griffin, Alisha Baines Simon, Erin Hulbert, John Stevenson, Joseph P. Grill, Siamak Noorbaloochi, Melissa R Partin

Research output: Contribution to journalReview articlepeer-review

28 Scopus citations


Background: Maximizing response rates is critically important in order to provide the most generalizable and unbiased research results. High response rates reduce the chance of respondents being systematically different from non-respondents, and thus, reduce the risk of results not truly reflecting the study population. Monetary incentives are often used to improve response rates, but little is known about whether larger incentives improve response rates in those who previously have been unenthusiastic about participating in research. In this study we compared the response rates and cost-effectiveness of a $5 versus $2 monetary incentive accompanying a short survey mailed to patients who did not respond or refused to participate in research study with a face-to-face survey. Methods. 1,328 non-responders were randomly assigned to receive $5 or $2 and a short, 10-question survey by mail. Reminder postcards were sent to everyone; those not returning the survey were sent a second survey without incentive. Overall response rates, response rates by incentive condition, and odds of responding to the larger incentive were calculated. Total costs (materials, postage, and labor) and incremental cost-effectiveness ratios were also calculated and compared by incentive condition. Results: After the first mailing, the response rate within the $5 group was significantly higher (57.8% vs. 47.7%, p < .001); after the second mailing, the difference narrowed by 80%, resulting in a non-significant difference in cumulative rates between the $5 and $2 groups (67.3% vs. 65.4%, respectively, p = .47). Regardless of incentive or number of contacts, respondents were significantly more likely to be male, white, married, and 50-75 years old. Total costs were higher with the larger versus smaller incentive ($13.77 versus $9.95 per completed survey). Conclusions: A $5 incentive provides a significantly higher response rate than a $2 incentive if only one survey mailing is used but not if two survey mailings are used.

Original languageEnglish (US)
Article number81
JournalBMC Medical Research Methodology
StatePublished - 2011

Bibliographical note

Funding Information:
This research was supported by the Department of Veterans Affairs, including a grant from VA HSR&D (CRI-03-151-1). Dr. Griffin also received support as a Merit Review Entry Program (MREP) awardee. The views expressed in this article are those of the author(s) and do not necessarily represent the views of the Department of Veterans Affairs.


  • Cost-effectiveness
  • data collection
  • financial incentives
  • incremental cost-effectiveness ratios
  • non-response
  • response rate


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