Abstract
Study objective: To assess the effectiveness of a telephone reminder in increasing responses to postal surveys and to calculate the differential costs per completed questionnaire.
Design: Randomised controlled trial.
Setting: Australian university and rehabilitation medicine practice.
Participants: The trial was conducted in 1999 among the 143 non-respondents to a questionnaire about work related neck and upper body disorders. The questionnaire was sent to two Australian female samples: 200 office workers (Sample A) and 92 former rehabilitation medicine patients (Sample B). A reminder letter, another copy of the questionnaire and a final letter were sent at two week intervals. Half of the non-respondents within each sample were randomly selected to receive a telephone reminder just after the second mailout of the questionnaire. All direct costs were calculated.
Main results: Responses were significantly higher among those who received the telephone reminder intervention (relative risk 2.54, 95% confidence intervals 1.43 to 4.52). Analysed by intention to phone, 47% of non-respondents in Sample A and 38% in Sample B returned a complete questionnaire after the intervention, compared with 21% and 10%, respectively, in the control groups. For the 112 women (combined samples) who returned completed questionnaires before randomisation, the average cost per respondent was AUD14. There was a higher total cost for the intervention groups (AUD851 versus AUD386 for controls), but the significantly higher number of additional completed responses (31 versus 12) resulted in a 15% lower marginal cost per completed questionnaire in those groups.
Conclusion: Telephone reminders are cost effective in improving responses to postal surveys.
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Selected References
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- Hoffman S. C., Burke A. E., Helzlsouer K. J., Comstock G. W. Controlled trial of the effect of length, incentives, and follow-up techniques on response to a mailed questionnaire. Am J Epidemiol. 1998 Nov 15;148(10):1007–1011. doi: 10.1093/oxfordjournals.aje.a009566. [DOI] [PubMed] [Google Scholar]
- Perneger T. V., Etter J. F., Rougemont A. Randomized trial of use of a monetary incentive and a reminder card to increase the response rate to a mailed health survey. Am J Epidemiol. 1993 Nov 1;138(9):714–722. doi: 10.1093/oxfordjournals.aje.a116909. [DOI] [PubMed] [Google Scholar]
- Roberts H., Pearson J. C., Dengler R. Impact of a postcard versus a questionnaire as a first reminder in a postal lifestyle survey. J Epidemiol Community Health. 1993 Aug;47(4):334–335. doi: 10.1136/jech.47.4.334. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tai S. S., Nazareth I., Haines A., Jowett C. A randomized trial of the impact of telephone and recorded delivery reminders on the response rate to research questionnaires. J Public Health Med. 1997 Jun;19(2):219–221. doi: 10.1093/oxfordjournals.pubmed.a024613. [DOI] [PubMed] [Google Scholar]
- Urban N., Anderson G. L., Tseng A. Effects on response rates and costs of stamps vs business reply in a mail survey of physicians. J Clin Epidemiol. 1993 May;46(5):455–459. doi: 10.1016/0895-4356(93)90022-s. [DOI] [PubMed] [Google Scholar]