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. 2021 Jul 28;5(7):e23229. doi: 10.2196/23229

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©Sigrid Hegna Ingvaldsen, Erling Tronvik, Eiliv Brenner, Ingunn Winnberg, Alexander Olsen, Gøril Bruvik Gravdahl, Anker Stubberud. Originally published in JMIR Formative Research (https://formative.jmir.org), 28.07.2021.

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 Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on https://formative.jmir.org, as well as this copyright and license information must be included.

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Boxplot of evaluation questionnaires. Horizontal lines represent medians, upper and lower box limits represent IQR, whiskers represent IQR*1.5, and diamonds represent outliers. Each pair of boxes shows the usability domain score after 2 (light blue) and 4 (dark blue) weeks of use. Note that functionality and design have the highest scores, whereas engagement and biofeedback scores are lower.