Retrospective observational study
291
Epidemiological and clinical features of 291 cases with coronavirus disease 2019 in areas adjacent to Hubei, China: a double-center observational study [medrxiv]
0
COVID-19 (severe/critical)
Comorbidities
Chronic respiratory disease
Not present
Present
Odds ratio
5.240 (1.460-18.900)
No
Yes