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. 2021 Sep 16;5(9):e30819. doi: 10.2196/30819

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©Kan Yamagami, Akihiro Nomura, Mitsuhiro Kometani, Masaya Shimojima, Kenji Sakata, Soichiro Usui, Kenji Furukawa, Masayuki Takamura, Masaki Okajima, Kazuyoshi Watanabe, Takashi Yoneda. Originally published in JMIR Formative Research (https://formative.jmir.org), 16.09.2021.

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

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The clinical courses of patients JCHO-008, JCHO-016, and JCHO-023. The vertical columns represent estimated oxygen variation (EOV), resting heart rate (RHR) (compared with minimum RHR), body temperature (BT), and cough or fatigue severity levels. The horizontal axis represents the number of days after a positive SARS-CoV-2 polymerase chain reaction (PCR) test (JCHO-008) or the occurrence of COVID-19–related symptoms (JCHO-016 and JCHO-023). Gray columns represent a day when no EOV data were obtained. FiO₂: fraction of inspired oxygen; JCHO: Japan Community Health Care Organization; NHF: nasal high flow; Re-ad: readmission.