We also tested the association between the number of app functions in use (at baseline) and changes in PA level (simple change score, ie, follow-up minus baseline) among continued users, which did not reach statistical significance ( r =–0.02, P =.48).
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Functions of Smartphone Apps and Wearable Devices Promoting Physical Activity: Six-Month Longitudinal Study on Japanese-Speaking Adults.
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0.4800
0.4800