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Direct linkGlassman, Jill R.; Potter, Susan C.; Baumler, Elizabeth R.; Coyle, Karin K. – Health Education & Behavior, 2015
Introduction: Group-randomized trials (GRTs) are one of the most rigorous methods for evaluating the effectiveness of group-based health risk prevention programs. Efficiently designing GRTs with a sample size that is sufficient for meeting the trial's power and precision goals while not wasting resources exceeding them requires estimates of the…
Descriptors: Health Education, Longitudinal Studies, Correlation, Comparative Analysis
