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. 2021 Jun 7;9(6):e22748. doi: 10.2196/22748

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©Dario Salvi, Emma Poffley, Lionel Tarassenko, Elizabeth Orchard. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 07.06.2021.

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 https://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Bland-Altman plots of the differences between 19,356 matched samples of SpO₂ and heart rate values measured simultaneously by two different pulse oximeters during 38 6-minute walk tests (6MWTs). SpO₂: peripheral oxygen saturation.