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. 2016 Sep 7;18(9):e239. doi: 10.2196/jmir.5531

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©Sjaan R Gomersall, Norman Ng, Nicola W Burton, Toby G Pavey, Nicholas D Gilson, Wendy J Brown. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 07.09.2016.

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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Bland-Altman plots for device steps and ActiGraph steps: Fitbit (panel A; n=135), Jawbone UP (panel B; n=154). The solid line represents the mean difference (steps) between the two measures and the dashed lines are the 95% limits of agreement.