Hazard ratios estimated by multivariate proportional hazard Cox model
| Variables | HR | LL | UL | p value |
| Age (continuous) | 1.036 | 1.021 | 1.052 | <0.001 |
| Any comorbidity (yes versus no) | 2.132 | 1.393 | 3.261 | <0.001 |
| Wuhan-related exposure (yes versus no) | 1.13 | 0.556 | 2.296 | 0.735 |
| Hubei location (yes versus no) | 1.333 | 0.86 | 2.065 | 0.198 |
| From symptom onset to hospitalisation (continuous) | 1.045 | 1.013 | 1.078 | 0.005 |
HR: hazards ratio; LL: lower limit of the 95% confidence interval; UL: upper limit of the 95% confidence interval. Comorbidity included chronic obstructive pulmonary disease (COPD), diabetes mellitus, hypertension, coronary heart disease, cerebrovascular disease, viral hepatitis type B, malignant tumor, chronic kidney disease and immunodeficiency.