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| Prognostic factors | β | Hazard ratio (95% CI) | P value |
|---|---|---|---|
| Age | 0.333 | 1.395 (1.214-1.602) | <0.001 |
| Tumor size | 0.425 | 1.529 (1.318-1.775) | <0.001 |
| Tumor depth | 0.448 | 1.565 (1.416-1.730) | <0.001 |
| Lymph node metastasis | 0.520 | 1.681 (1.563-1.809) | <0.001 |
| Fever | 0.206 | 1.229 (1.116-1.353) | <0.001 |
