Prognostic value of number of examined lymph nodes in patients with node-negative gastric cancer

Table 1 Overall survival by total examined lymph nodes and cut-point analysis in each subgroup

Depth of invasion	≤ 3 vs≥ 4		≤ 10 vs≥ 11		≤ 15 vs≥ 16		≤ 25 vs≥ 26
	χ2	P value	χ2	P value	χ2	P value	χ2	P value
T1 + T2	8.333	0.004	9.679	0.002	11.023	0.001	0.825	0.364
T3 + T4	5.529	0.019	7.884	0.005	13.204	< 0.001	9.476	0.002
Total	8.711	0.003	16.589	< 0.001	20.612	< 0.001	5.770	0.016