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. 2021 Jun 4;9(6):e26006. doi: 10.2196/26006

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©Dan E Webster, Meghasyam Tummalacherla, Michael Higgins, David Wing, Euan Ashley, Valerie E Kelly, Michael V McConnell, Evan D Muse, Jeffrey E Olgin, Lara M Mangravite, Job Godino, Michael R Kellen, Larsson Omberg. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 04.06.2021.

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 analysis comparing heart rate measurements in the validation study using data collected during the Tecumseh tests. In the validation cohort, participants used multiple ways of collecting heart rate. The method being tested, the smartphone camera, was compared to: (A) a Polar chest strap (considered a gold standard) while in the clinic when both were used and (B) a Fitbit worn during the entirety of the study. (C) We also compared the Polar strap to the Fitbit for all time that both were worn. HR: heart rate.