Published on in Vol 21, No 11 (2019): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/14645, first published
.
![User Engagement and Attrition in an App-Based Physical Activity Intervention: Secondary Analysis of a Randomized Controlled Trial User Engagement and Attrition in an App-Based Physical Activity Intervention: Secondary Analysis of a Randomized Controlled Trial](https://asset.jmir.pub/assets/ee116f2c4dff5feb4fdbcda37a5ef8f4.png 480w,https://asset.jmir.pub/assets/ee116f2c4dff5feb4fdbcda37a5ef8f4.png 960w,https://asset.jmir.pub/assets/ee116f2c4dff5feb4fdbcda37a5ef8f4.png 1920w,https://asset.jmir.pub/assets/ee116f2c4dff5feb4fdbcda37a5ef8f4.png 2500w)
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