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. 2020 Nov 2;8(10):e20465. doi: 10.2196/20465

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©Milad Asgari Mehrabadi, Iman Azimi, Fatemeh Sarhaddi, Anna Axelin, Hannakaisa Niela-Vilén, Saana Myllyntausta, Sari Stenholm, Nikil Dutt, Pasi Liljeberg, Amir M Rahmani. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 02.11.2020.

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

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Bland-Altman plots for total sleep time, sleep efﬁciency, and wake after sleep onset gathered by the Oura ring and the actigraphy device. Subjects’ actigraphy minus Oura ring discrepancies on sleep parameters (y-axis) are plotted compared with actigraphy (x-axis). Biases, upper, and lower agreement limits are marked. In addition, the satisfactory ranges are plotted as the dashed lines. SE: sleep efﬁciency; TST: total sleep time; WASO: wake after sleep onset.