International Journal of Epidemiology 2003;32:637-638
© International Epidemiological Association 2003
Commentary: Improving response rates to mailed surveys: what do we learn from randomized controlled trials?
1 Center for Clinical Epidemiology and Biostatistics,
2 Center for Bioethics,
3 Center for Education and Research on Therapeutics,
4 Leonard Davis Institute of Health Economics, and
5 Division of General Internal Medicine, University of Pennsylvania, Philadelphia, PA, USA.
6 Center for Health Equity Research and Promotion, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA, USA.
Correspondence: David A Asch, Leonard Davis Institute of Health Economics, 3641 Locust Walk, Philadelphia, PA 19104, USA. E-mail: asch@wharton.upenn.edu
| The first 10% of the full text of this article appears below. |
Surveying physicians via mailed questionnaires often provides valuable information about physicians knowledge, attitudes, and behaviours. Unfortunately, low response rates may introduce bias in that information on those who complete the questionnaire differs from those who do not, in ways related to the outcomes being evaluated.13
There is no necessary relation between low response rates and bias.1,2 A 10% response rate in a survey of 100 000 physicians would introduce no bias if the 10 000 responders were similar to the underlying target population in the behaviours or beliefs being evaluated. By contrast, a 90% response rate in this survey might
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