Published on in Vol 8, No 10 (2021): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/29426, first published
.
![Passive Sensing of Preteens’ Smartphone Use: An Adolescent Brain Cognitive Development (ABCD) Cohort Substudy Passive Sensing of Preteens’ Smartphone Use: An Adolescent Brain Cognitive Development (ABCD) Cohort Substudy](https://asset.jmir.pub/assets/90566aa1c8590990580d13165f5f2816.png 480w,https://asset.jmir.pub/assets/90566aa1c8590990580d13165f5f2816.png 960w,https://asset.jmir.pub/assets/90566aa1c8590990580d13165f5f2816.png 1920w,https://asset.jmir.pub/assets/90566aa1c8590990580d13165f5f2816.png 2500w)
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