Identifying subgroups that succeed or fail with three levels of physical activity intervention: the Activity Counseling Trial
Division of Epidemiology, Department of Health Research and Policy, School of Medicine, Stanford University, Stanford, CA 94305-5705, USA. Health Psychology
(Impact Factor: 3.59).
06/2006; 25(3):336-47. DOI: 10.1037/0278-618.104.22.1686
The authors used recursive partitioning methods to identify combinations of baseline characteristics that predict 2-year physical activity success in each of 3 physical activity interventions delivered in the multisite Activity Counseling Trial. The sample consisted of 874 initially sedentary primary care patients, ages 35-75 years, who were at risk for cardiovascular disease. Predictors of 2-year success were specific to each intervention and represented a range of domains, including physiological, demographic, psychosocial, health-related, and environmental variables. The results indicate how specific patient subgroups (e.g., obese, unfit individuals; high-income individuals in stable health) may respond differently to varying levels and amounts of professional assistance and support. The methods used provide a practical first step toward identifying clinically meaningful patient subgroups for further systematic investigation.
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