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. 2021 Nov 17;5(11):e29128. doi: 10.2196/29128

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©Pim van Oirschot, Marco Heerings, Karine Wendrich, Bram den Teuling, Frank Dorssers, René van Ee, Marijn Bart Martens, Peter Joseph Jongen. Originally published in JMIR Formative Research (https://formative.jmir.org), 17.11.2021.

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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Bland Altman plot of differences between the measured "distance walked" by the app (smartphone-based 2-Minute Walking Test distance) and the distance markers (2-Minute Walking Test distance) expressed as percentages of the 2-Minute Walking Test distance (∆ distance / 2-Minute Walking Test distance) versus the 2-Minute Walking Test distance. The dashed line shows the mean percentage difference, the dotted lines show the 95% CI.