Background Coronavirus disease 2019 (COVID-19) has spread worldwide rapidly. However, the effects of asthma, asthma medication and asthma severity on the clinical outcomes of COVID-19 have not yet been established. Methods The study included 7590 de-identified patients, who were confirmed to have COVID-19 using the severe acute respiratory syndrome coronavirus 2 RNA-PCR tests conducted up to May 15, 2020; we used the linked-medical claims data provided by the Health Insurance Review and Assessment Service. Asthma and asthma severity (steps suggested by the Global Initiative for Asthma) were defined using the diagnostic code and history of asthma medication usage.



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Citation: Yong Jun ChoiJu-Young ParkHye Sun LeeJin SuhJeung Yoon SongMin Kwang ByunJae Hwa ChoHyung Jung KimJae-Hyun LeeJung-Won ParkHye Jung Park