Table 4. Overall survival rates with different pN and rN classifications stratified by the LODDS staging system.

	LODDS1		LODDS2		LODDS3		LODDS4		P a
	No	5-YSR(%)	No.	5-YSR(%)	No.	5-YSR(%)	No.	5-YSR(%)
N stage
N0	209	71.1	48	61.8	10	42.6	-	-	0.035
N1	51	68.0	39	55.2	23	33.3	-	-	0.04
N2	37	77.2	59	49.2	40	29.1	32	18.2	<0.001
N3	8	75.0	28	38.8	69	24.7	77	13.6	0.005
P b	0.796		0.396		0.872		0.892
R stage
R0	205	70.3	54	60.4	8	42.0	-	-	0.009
R1	100	71.3	85	51.6	10	29.4	-	-	0.026
R2	-	-	35	47.3	78	28.7	30	15.4	0.018
R3	-	-	-	-	46	26.3	79	14.8	0.003
P c	0.827		0.497		0.329		0.920

Abbreviations: LODDS, Log Odds of Positive Lymph Nodes; No, number of patients; 5-YSRs, 5-year survival rate.

^aComparison of overall survival rates between different LODDS groups.

^bComparison of overall survival rates between different pN groups.

^cComparison of overall survival rates between different rN groups.