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. 2021 May 7;100(18):e25900. doi: 10.1097/MD.0000000000025900

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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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Demographic distribution of the patients with COVID-19 in Korea. (A) The patients in 50 s was the largest age group followed by those in 20 s. Female was predominant throughout all age groups except those younger than 20. (B) Hypertension (21.3%) and diabetes mellitus (12.3%) were the most common two comorbidities. It was followed by dementia, chronic heart disease, malignancy, asthma, chronic liver disease, congestive heart failure, chronic kidney disease, chronic obstructive pulmonary disease, and connective tissue disease. CHF = Congestive heart failure, CKD = Chronic kidney disease, CLD = Chronic liver disease, COPD = Chronic obstructive pulmonary disease, COVID-19 = coronavirus disease 2019, CTD = Connective tissue disease, HTN = hypertension.