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Title: The effect of a monetary incentive on return of a postal health and development questionnaire: A randomised trial [ISRCTN53994660]
Authors: Kenyon, Sara
Taylor, David
Pike, Katie
Jones, David
Salt, A.
Marlow, N.
Brocklehurst, P.
First Published: 18-Aug-2005
Publisher: BioMed Central
Citation: BMC Health Services Research, 2005, 5, 55
Abstract: Background: Postal questionnaires are widely used to collect data in healthcare research but a poor response rate may reduce the validity and reliability of results. There was a lack of evidence available relating to use of a monetary incentive to improve the response rate in the healthcare setting. Methods: The MRC ORACLE Children Study is assessing the health and development of nearly 9000 seven year old children whose mothers' joined the MRC ORACLE Trial. We carried out a randomised controlled trial of inclusion of monetary incentive (five pound voucher redeemable at many high street stores) with the reminder questionnaire to parents. This trial took place between April 2002 and November 2003. When the parents were sent the reminder questionnaire about their child's health and development they were randomly assigned by concealed computer-generated allocation stratified by week of birthday to receive a five pound voucher or no incentive. The population were 722 non-responders to the initial mailing of a 12-page questionnaire. Main outcome measures: Difference in response rate between the two groups. Results: Inclusion of the voucher with the reminder questionnaire resulted in a 11.7%(95% CI 4.7% to 18.6%) improvement in the response rate between the two groups. Conclusion: This improvement in response rate and hence the validity and reliability of results obtained appears to be justified ethically and financially.
DOI Link: 10.1186/1472-6963-5-55
ISSN: 1472-6963
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 Kenyon et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Appears in Collections:Published Articles, Dept. of Cancer Studies and Molecular Medicine

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