Table 3.

Comparison of the performance of various editions of the TNM staging system.

Model	Concordance index		ROC curve		AIC
	C-index	95% CI	AUC	95% CI
TNM stage (AJCC 7th)	0.725	0.717-0.740	0.770	0.759-0.781	56,463.140
TNM stage (AJCC 8th)	0.734	0.720-0.741	0.773	0.762-0.783	56,396.524
Stage III (AJCC 7th)	0.594	0.581-0.607	0.607	0.587-0.626	31,552.480
Stage III (AJCC 8th)	0.608	0.599-0.624	0.621	0.602-0.640	31,515.240
Revised TNM system	0.741	0.730-0.748	0.774	0.763-0.784	56,355.250

ROC curve: receiver operating characteristic curve; AUC: area under curve; 95% CI: 95% confidence interval; AIC: Akaike information criterion.