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. 2020 Dec 11;10:21805. doi: 10.1038/s41598-020-77791-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Flowchart of the study population. A total of 7590 coronavirus disease (COVID-19) patients were identified using the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) diagnosis code. Among 7272 adult patients ≥ 20 years of age, 686 patients with asthma were identified using the ICD-10 code and medication use for asthma. Severity of asthma was classified according to the type of medication prescribed. COVID-19, coronavirus disease.