Table 4.

Five-year overall survival by T stage subgroups and total number of examined lymph nodes

Variables	Number of examined nodes (n)				χ2	P value
	1-3	4-10	11-15	≥ 16
Depth of invasion
T1	60.0%	91.7%	-	92.3%	4.598	0.204
T2	58.3%	68.2%	84.0%	91.4%	9.668	0.022
T3	50.0%	63.3%	81.8%	91.7%	8.738	0.033
T4	35.1%	48.6%	62.5%	78.7%	31.487	< 0.001
Total	43.3%	56.6%	71.8%	84.3%	51.837	< 0.001