Table 2.

Prognostic value of factors assessed in ROC analyses

Factors	Area under curve (AUC)	95% CI		Std. error	P
		Lower	Upper
pN7 (4 subgroups)	0.727	0.684	0.769	0.022	<0.001
pN8 (5 subgroups)	0.730	0.688	0.772	0.021	<0.001
7th TNM system (9 subgroups)	0.800	0.764	0.837	0.019	<0.001
8th TNM system (9 subgroups)	0.799	0.762	0.835	0.019	<0.001
7th TNM system (22 subgroups)	0.803	0.767	0.839	0.019	<0.001
8th TNM system (27 subgroups)	0.809	0.773	0.844	0.018	<0.001
6th TNM system	0.793	0.756	0.830	0.019	<0.001

ROC, Receiver operating characteristic; CI, confidence interval.