Table 4. Cox proportional model for staging groupings.
| Factors | AJCC 7th staging | AJCC 8th staging | Japanese 11th classification | |||||
|---|---|---|---|---|---|---|---|---|
| HR (95% CI) | P | HR (95% CI) | P | HR (95% CI) | P | |||
| Stage grouping | ||||||||
| 0 | Reference | Reference | Reference | |||||
| I | 2.886 (0.581–14.327) | 0.195 | ||||||
| II | 2.855 (1.220–6.683) | 0.016 | 2.452 (0.996–6.037) | 0.051 | 5.646 (1.281–24.879) | 0.022 | ||
| III | 7.195 (3.161–16.378) | <0.001 | 5.618 (2.450–12.881) | <0.001 | 21.178 (4.829–92.883) | <0.001 | ||
| IV | – | – | 12.019 (3.645–39.633) | <0.001 | – | – | ||
| Concordance index | 0.813 (0.732–0.896) | 0.805 (0.726–0.885) | 0.837 (0.766–0.908) | |||||
AJCC, the American Joint Committee on Cancer; HR, hazard ratio; CI, confidence interval.