mActive: A Randomized Clinical Trial of an Automated mHealth Intervention for Physical Activity Promotion.

Secondary Outcomes: Total and Aerobic Activity Times In phase I (Table 2 ), the unblinded and blinded groups were not significantly different in modifying their total activity times, whereas there was a borderline significant smaller decrease in aerobic time in unblinded patients (differential 8 minutes; 95% CI, 0 to 16; P =0.05).

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