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Recruitment of a racially and ethnically diverse sample into a physical activity efficacy trial

Southern Methodist University, Dallas, Texas, United States, georitafrierson{at}yahoo.com

David M Williams

Alpert Medical School of Brown University and the Miriam Hospital, Centers for Behavioral and Preventive Medicine, Providence, Rhode Island, United States

Shira Dunsiger

Brown University, Program in Public Health, Providence, Rhode Island, United States

Beth A Lewis

University of Minnesota Twin Cities, Minneapolis, Minnesota United States

Jessica A Whiteley

Alpert Medical School of Brown University and the Miriam Hospital, Centers for Behavioral and Preventive Medicine, Providence, Rhode Island, United States

Anna E Albrecht

Alpert Medical School of Brown University and the Miriam Hospital, Centers for Behavioral and Preventive Medicine, Providence, Rhode Island, United States

John M Jakicic

University of Pittsburgh, Department of Health and Physical Activity, Pittsburgh, Pennsylvania United States

Santina M Horowitz

The Miriam Hospital, Centers for Behavioral and Preventive Medicine, Providence, Rhode Island United States

Bess H Marcus

Brown University, Program in Public Health, Providence, Rhode Island United States

Background Healthy People 2010 underscores the relevance of eliminating health disparities. Thus, it is paramount to create interventions that promote health for all individuals.

Purpose This study examined differences in rates of and reasons for ineligibility among non-Hispanic blacks and whites in a randomized controlled physical activity intervention study.

Methods Participants (1245 adults) responded to community advertising for the research study. Eligibility at the four pre-randomization assessment sessions was determined by self-reported medical information, resting EKG, 7-Day Physical Activity Recall, fitness test and Stage of Change. We used t-tests to examine the rates of eligibility among participant subgroups.

Results Blacks had higher rates of overall ineligibility (86.9%) than whites (75.1%; p < 0.01) and were more likely to be ineligible due to lack of interest or no-show at a pre-randomization appointment (35.4% vs. 24.3%; p < 0.01). Blacks were more likely to be ineligible for medical reasons after the telephone screen (16.3% vs. 7.8%; p = 0.01).

Limitations This study did not use a random sampling of potential participants from each of the racial/ethnic groups and thus, there is the potential for selection bias.

Conclusions Blacks were more likely to choose not to enroll in the study due to a lack of interest, but had similar rates of overall medical ineligibility to whites. This highlights the importance of strategies that enhance interest among blacks, who initially respond to recruitment advertising. Clinical Trials 2008; 5: 504—516. http://ctj.sagepub.com

Clinical Trials, Vol. 5, No. 5, 504-516 (2008)
DOI: 10.1177/1740774508096314


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