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. 2021 Jul 16;100(28):e26503. doi: 10.1097/MD.0000000000026503

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Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial License 4.0 (CCBY-NC), where it is permissible to download, share, remix, transform, and buildup the work provided it is properly cited. The work cannot be used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc/4.0

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Study flow chart. A total of 2923 patients diagnosed with COVID-19 were included in this study, with 20 patients categorized as mild cases; 2104 moderate patients; 711 severe cases, and 88 critical cases (37 recovered cases, 51 deaths). Among them, patients with five blood tests were 145 severe cases and 60 critical cases (29 recovered cases, 31 deaths).