Retrospective observational study
275
mainland China outside of Hubei Province, from December 18th, 2019 to March 8, 2021
History of coronary heart disease increases the mortality rate of COVID-19 patients: a nested case-control study
0
COVID-19 (death)
Comorbidities
Heart disease
Not present
Present
Hazard ratio
4.200 (2.500-7.100)
No
Yes