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Cox proportional hazards regression model of overall survival
| Variable | Parameter estimate | Standard error | P-value | Hazard ratio |
|---|---|---|---|---|
| Chemotherapy at time of RT | −1.19 | 0.53 | 0.03 | 0.31 |
| Irradiated tumor size (cm) | 0.07 | 0.04 | 0.07 | 1.07 |
| Metastasis at time of RT | 1.28 | 0.65 | 0.05 | 3.59 |
