Table 3.

C-index of nomogram and American Joint Committee on Cancer 8th staging system

Category	Nomogram			AJCC 8th stage			P.value (nomogram vs AJCC 8th stage)
	C-Index	95% CI	P.value	C-Index	95% CI	P.value
OS
Training Set	0.6828	0.6777–0.6878	<0.001	0.6413	0.6362–0.6464	<0.001	<0.001
Validation Set	0.6762	0.6485–0.6649	<0.001	0.6348	0.6267–0.6429	<0.001	0.020

AJCC, American Joint Committee on Cancer.