| Mailing Strategies and Recruitment into an Intervention Trial of the Exercise Effect on Breast Cancer Biomarkers 1 (2009) | |||||||||||||
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| Recruitment into public health intervention trials can be costly and time-consuming. We examined two components of recruitment for an exercise trial: (a) a randomized pilot study of mailing strategies; and (b) the results from the entire recruitment process. In the pilot study, 4,999 women were randomized into one of four groups using a factorial design. The first factor was the inclusion or exclusion of a personal invitation letter, and the second was the use of first-class stamps versus bulk mail. We received 580 (11.6%) responses. Responses from interested women were nonsignificantly higher (odds ratio, 1.19; P � 0.10) for first-class versus bulk-rate postage. However, the cost to randomize one participant using first-class mail was $56.14 (in 1998 dollars) more | |||||||||||||
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