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. 2023 Nov 15;9:e47646. doi: 10.2196/47646

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©Marcin Straczkiewicz, Nancy L Keating, Embree Thompson, Ursula A Matulonis, Susana M Campos, Alexi A Wright, Jukka-Pekka Onnela. Originally published in JMIR Cancer (https://cancer.jmir.org), 15.11.2023.

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

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Bland-Altman plots with comparison of step counts in 3 validation approaches: (A) internal, (B) manual, and (C) wearable. (A) The horizontal axis indicates a mean step count from the 2 body locations; (B) estimated steps and manually counted ground truth; and (C) estimated steps and step counts obtained from Fitbit. The vertical axis indicates a difference between step counts from the 2 methods. Blue solid lines indicate mean bias, while dashed red lines indicate ±95% limits of agreement calculated as ±1.96 SD of the differences between the 2 methods.