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. 2023 Feb 23;6:29. doi: 10.1038/s41746-022-00745-z

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Receiver-operating characteristics (ROC) used for tuning parameter selection using one vs. all approach (normal walking vs. all non-walking activities). ROCs were computed separately for sensor body locations common to the smartphone (a) and smartwatch (b). Dots represent optimal cutoff points at which the sum of sensitivity and specificity is maximized.