China
Retrospective cohort study
Medical records
449
Consecutive patients with severe COVID-19
181 females and 268 males. The mean age at disease onset was 65.1 years
Total
28 Day
COVID-19 (death)
134
Died within 28 days
Comorbidities
Any comorbidity
none
Not present
43
177
Present
91
272
Odds ratio
0.860 (0.540-1.380)
No
Yes
risk was adjusted for age, sex ratio, treating with heparin, prothrombin time, platelet count and D-dimer
None
Good