4. Prognostic efficiency of different lymph node staging systems of OS in training cohort.

System	C-index	AIC	AUC
			1-year survival	3-year survival	5-year survival
OS, overall survival; C-index, concordance index; AIC, Akaike information criterion; AUC, area under the curve; LNR, lymph node ratio; LODDS, log odds of positive lymph nodes.
N stage	0.734	4,524.74	0.729	0.815	0.839
LNR System	0.737	4,512.35	0.728	0.820	0.835
LODDS System	0.745	4,498.97	0.744	0.827	0.844