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基础病史比较
Comparison of underlying diseases of the patients
| Comorbidities | Moderate (n=32) | Severe (n=31) | χ2 | P |
| *Fisher' exact probability was calculated. | ||||
| Hypertension | 9 | 15 | 2.741 | 0.098 |
| Diabetes | 3 | 9 | 3.946 | 0.047 |
| Coronary heart disease | 0 | 2 | NA* | 0.238 |
| Tumor | 1 | 2 | 0.001 | 0.978 |
| Lung Disease | 2 | 1 | 0.000 | 1.000 |
