Journal
ANNALS OF BEHAVIORAL MEDICINE
Volume 40, Issue 1, Pages 40-48Publisher
OXFORD UNIV PRESS INC
DOI: 10.1007/s12160-010-9189-1
Keywords
Recruitment; Participation; Clinical trials; Representativeness; Research methods
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Funding
- NIDDK NIH HHS [2 R01 DK035524-21, R37 DK035524] Funding Source: Medline
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Background Little is known about the reach of Internet self-management interventions. Purpose The aim of this study was to evaluate different definitions of participation rate and compare characteristics among subcategories of participants and nonparticipants on demographic and clinical factors using de-identified electronic medical record data. Methods Data are presented on recruitment results and characteristics of 2,603 health maintenance organization members having type 2 diabetes invited to participate in an Internet self-management program. Results There was a 37% participation rate among all members attempted to contact and presumed eligible. There were several significant differences between participants and nonparticipants and among subgroups of participants (e.g., proactive volunteers vs. telephone respondents) on factors including age, income, ethnicity, smoking rate, education, blood pressure, and hemoglobin A1c. Conclusion These results have important implications for the impact of different recruitment methods on health disparities and generalization of results. We provide recommendations for reporting of eligibility rate, participation rate, and representativeness analyses.
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