Published on in Vol 9, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/24472, first published
.
![Acceptability, Validity, and Engagement With a Mobile App for Frequent, Continuous Multiyear Assessment of Youth Health Behaviors (mNCANDA): Mixed Methods Study Acceptability, Validity, and Engagement With a Mobile App for Frequent, Continuous Multiyear Assessment of Youth Health Behaviors (mNCANDA): Mixed Methods Study](https://asset.jmir.pub/assets/5009eeaa2a9ba03d29a28c97d1e0b37c.png 480w,https://asset.jmir.pub/assets/5009eeaa2a9ba03d29a28c97d1e0b37c.png 960w,https://asset.jmir.pub/assets/5009eeaa2a9ba03d29a28c97d1e0b37c.png 1920w,https://asset.jmir.pub/assets/5009eeaa2a9ba03d29a28c97d1e0b37c.png 2500w)
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