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Including the questionnaire with an invitation letter did not improve a telephone survey's response rate
Christopher M Byrne1, James D Harrison, Jane M Young
1Surgical Outcomes Research Centre, Sydney South West Area Health Service & University of Sydney, Australia.
Objective:
To determine whether including the study questionnaire with a letter of invitation improves the response rate in a telephone-based survey.
Study Design And Setting:
This randomized controlled trial was part of a larger study to assess patient preferences for novel and controversial treatments for inflammatory bowel disease at Royal Prince Alfred Hospital, a tertiary referral teaching hospital in Sydney, Australia.
Results:
Of 270 eligible patients, 124 (46%) were randomized to receive the questionnaire plus invitation whereas 146 (54%) were in the control group receiving a letter of invitation only. The consent rate was 26% for those receiving the questionnaire and 36% for the control group. The odds ratio for consent to participate among those sent the questionnaire to those not sent the questionnaire was 0.63 (95% CI=0.37-1.07).
Conclusion:
This study found that the advance mailing of a questionnaire to potential participants in a telephone survey reduced the likelihood of their participation.
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