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HPV: human papillomavirus; CI: confidence interval
| Variable | Hazard Ratio (HR) | 95% CI | p-value |
| p16-+ or HPV-+ | Reference | ||
| p16-- or HPV-+ | 2.14 | (1.62-2.83) | <0.001 |
| p16-+ or HPV-- | 1.78 | (1.32-2.40) | 0.001 |
| p16-- or HPV-- | 2.87 | (2.14-3.84) | <0.001 |
| Age (continuous) | 1.04 | (1.01-1.07) | 0.012 |
| Tumor stages (I/II/III/IV) | 1.42 | (1.20-1.67) | <0.001 |
