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. 2022 Jan 25;11(3):587. doi: 10.3390/jcm11030587

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Flow chart of study population inclusion and exclusion criteria. This flow diagram illustrates the resulting number of 1555 recruited patients positive for SARS-CoV-2 admitted for hospitalization in 24 different public hospitals of the community of Madrid (Spain), between August-November 2020; and the number and reasons for excluding COVID-19 patients based our pre-determined criteria. Following this process, 21 patients were removed due to a hospital stay higher than 30 days, while 562 patients were removed because on admission serum albumin was not collected.