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. 2019 Oct 2;7(10):e14534. doi: 10.2196/14534

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©Rahel Gilgen-Ammann, Theresa Schweizer, Thomas Wyss. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 02.10.2019

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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Relative deviation of the energy expenditure (EE) estimation by the Polar Vantage M compared with the criterion measurement of the MetaMax 3B separated for each activity task. The red lines indicate the proposed equivalence zone (SD 20% of the mean); the lower and upper boundary of the boxplots indicate the 25% and 75% quantiles of EE data, respectively, and the middle notch indicates the median data value. The whiskers include all data points that fall within the 1.5 interquartile range of the 25% and 75% quantile values. Circles and stars indicate EE data points that lie beyond the 1.5 and 3 interquartile ranges, respectively.