5. Prognostic efficiency of different lymph node staging systems of CSS in training cohort.

System	C-index	AIC	AUC
			1-year survival	3-year survival	5-year survival
CSS, cancer-specific 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	0.741	4,155.07	0.738	0.820	0.845
LNR system	0.745	4,144.60	0.738	0.826	0.842
LODDS system	0.751	4,135.16	0.749	0.832	0.849