| Literature DB >> 892969 |
C A Newland, W E Waters, A P Standford, B G Batchelor.
Abstract
A major disadvantage of the mail survey in medical research is non-response, which may introduce bias. This study measured the effect of two simple factors on the response rate to a questionnaire concerning headache and migraine in a survey of 2,508 electors. The two factors were the class of postage and the colour of envelopes used; neither was found to have a significant effect. It was concluded that cheaper mailing methods are not likely to jeopardise response.Entities:
Mesh：
Year: 1977 PMID： 892969 DOI： 10.1093/ije/6.1.65
Source DB: PubMed Journal: Int J Epidemiol ISSN： 0300-5771 Impact factor: 7.196