Retrospective observational study
1590
575 hospitals in China, from November 21st, 2019 to January 31st, 2020
Comorbidity and its impact on 1,590 patients with COVID-19 in China: A Nationwide Analysis [medrxiv]
0
COVID-19 (severe/critical)
COVID-19 (critical)
Comorbidities
COPD
Chronic obstructive pulmonary disease
Not present
Present
Hazard ratio
2.680 (1.420-5.050)
No
Yes