Table 5. The prognostic performance of each staging system (Harrell C-index) at each center.

	TNM	New TNM	p-value
Overall
Yonsei	0.799(0.792–0.806)	0.799(0.792–0.806)	>.9999
NCC	0.747(0.736–0.758)	0.748(0.737–0.759)	0.9487
TU	0.703(0.669–0.737)	0.701(0.667–0.735)	0.9668
AGC
Yonsei	0.726(0.717–0.735)	0.727(0.718–0.736)	0.9374
NCC	0.695(0.680–0.710)	0.700(0.685–0.715)	0.8137
TU	0.702(0.656–0.748)	0.698(0.652–0.744)	0.9510
LN positive
Yonsei	0.703(0.694–0.712)	0.703(0.694–0.712)	>.9999
NCC	0.696(0.680–0.712)	0.701(0.685–0.717)	0.8251
TU	0.688(0.639–0.737)	0.682(0.634–0.730)	0.9303

NCC, National Cancer Center Hospital in Japan; TU, Tokyo University Hospital in Japan