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. 2010 Jan;7(1):127-35.
doi: 10.1123/jpah.7.1.127.

Population reach and recruitment bias in a maintenance RCT in physically active older adults

Brian C Martinson  1 , A Lauren Crain, Nancy E Sherwood, Marcia G Hayes, Nicolaas P Pronk, Patrick J O'Connor
Affiliations

Population reach and recruitment bias in a maintenance RCT in physically active older adults

Brian C Martinson et al. J Phys Act Health. 2010 Jan.

Abstract

Objective: To assess the representativeness of older adults recruited to a physical activity maintenance RCT by conducting sequential comparisons to characterize study sample composition changes occurring between sampling frame construction and study enrollment.

Method: Study subjects (N = 1049) were 50 to 70 year old men and women who had increased physical activity within the past year recruited from a Midwestern managed care organization.

Results: Those responding to an initial mailed screener differed on demographic, behavioral, and SES characteristics from those not responding. Compared with ineligibles, eligible individuals were significantly younger, more highly educated, and more likely to report improved health in the prior year. Compared with eligible individuals who did not enroll, enrollees had generally higher education and income.

Conclusions: Physical activity promotion programs in older adults may have limited reach and substantial volunteer bias. Additional strategies to increase the reach of physical activity interventions into the target population are needed.

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References

    1. Bilimoria KY, Stewart AK, Tomlinson JS, et al. Impact of Adjuvant Radiation on Survival: A Note of Caution When Using Cancer Registry Data to Evaluate Adjuvant Treatments. Ann Surg Oncol. 2007;14(12):3321–3327. - PubMed
    1. Glasgow RE, Green LW, Klesges LM, et al. External validity: we need to do more. Ann Behav Med. 2006;31(2):105–108. - PubMed
    1. Glasgow RE, Vogt TM, Boles SM. Evaluating the public health impact of health promotion interventions: the RE-AIM framework. Am J Public Health. 1999;89(9):1322–1327. - PMC - PubMed
    1. Bull SS, Gillette C, Glasgow RE, Estabrooks P. Work site health promotion research: to what extent can we generalize the results and what is needed to translate research to practice? Health Educ Behav. 2003;30(5):537–549. - PubMed
    1. Dzewaltowski DA, Estabrooks PA, Klesges LM, Bull S, Glasgow RE. Behavior change intervention research in community settings: how generalizable are the results? Health Promot Int. 2004;19(2):235–245. - PubMed

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