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Increasing the Response Rate to a Mailed Questionnaire by Including more Stamps on the Return Envelope: A Cotwin Control Study

Published online by Cambridge University Press:  21 February 2012

David L. Duffy  and
Nicholas G. Martin
David L. Duffy*
Affiliation:
Queensland Institute of Medical Research, Brisbane, Australia.
Nicholas G. Martin
Affiliation:
Queensland Institute of Medical Research, Brisbane, Australia.
*
*Address for correspondence: Dr David Duffy, Queensland Institute of Medical Research, Post Office, Royal Brisbane Hospital, Brisbane QLD 4029, Australia.

Abstract

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Twins taking part in two unrelated studies were sent a questionnaire together with a self-addressed envelope that either carried one or multiple (up to 5) stamps to the same value. The unprompted proportion of questionnaires returned (before commencement of telephone reminder calls) was increased from 62% to 71% in one study, and from 43% to 52% in the other study (test for common odds ratio in studies, p = 0.04).

Type
Articles
Information
Twin Research and Human Genetics , Volume 4 , Issue 2 , 01 April 2001 , pp. 71 - 72
Copyright
Copyright © Cambridge University Press 2001