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. 2021 Jan 12;9(1):e24806. doi: 10.2196/24806

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©Veronica Sjöberg, Jens Westergren, Andreas Monnier, Riccardo Lo Martire, Maria Hagströmer, Björn Olov Äng, Linda Vixner. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 12.01.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Bland-Altman plot visualizing agreement of energy expenditure (MET) estimated by Fitbit Versa and relative criterion measurement ActiGraph GT3X during overall treadmill walk. The middle green line shows the mean difference (bias) between devices. The dashed lines indicate upper (+1.96 SD) and lower (–1.96 SD) limits of agreement and the black line represents the regression line illustrating association between estimations.