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. 2014 Dec 1;16(12):e269. doi: 10.2196/jmir.3626

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©Pedro F Saint-Maurice, Gregory J Welk. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 01.12.2014.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Relation between percent time in moderate-to-vigorous physical activity (MVPA) measured by the SenseWear Armband accelerometer and YAP raw scores during physical education (PE; bottom) and during after-school time (top) (n=221 participants from grades 4 to 12). The solid black line represents the line of best fit with respective 95% confidence intervals; the dashed red line fits a smooth curve across the distribution of scores. The lack of overlap between these suggests a nonlinear trend relation between percent time in MVPA and YAP scores.