Published on in Vol 9, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/22601, first published
.
![Effects of Smartphone-Based Interventions on Physical Activity in Children and Adolescents: Systematic Review and Meta-analysis Effects of Smartphone-Based Interventions on Physical Activity in Children and Adolescents: Systematic Review and Meta-analysis](https://asset.jmir.pub/assets/b161a9dc6c38c5a56d180673b4dfc9f2.png 480w,https://asset.jmir.pub/assets/b161a9dc6c38c5a56d180673b4dfc9f2.png 960w,https://asset.jmir.pub/assets/b161a9dc6c38c5a56d180673b4dfc9f2.png 1920w,https://asset.jmir.pub/assets/b161a9dc6c38c5a56d180673b4dfc9f2.png 2500w)
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