Table 3. Analysis of the number of resected lymph nodes and tumor size using the Cox proportional hazards model.

Cut-off value for lymphnode number	Chi-square score	p
0,1–5, >5	15.423	0.000
0,1–6, >6	16.485	0.000
0,1–7, >7	17.477	0.000
0,1–8, >8	14.183	0.001
0,1–9, >9	13.455	0.001
Cut-off value for tumor size	Chi-square score	p
≤2, >2	7.032	0.008
≤2.5, >2.5	11.781	0.001
≤3, >3	11.372	0.001
≤3.5, >3.5	20.689	0.000
≤4, >4	17.324	0.000
≤4.5, >4.5	15.132	0.000
≤5, >5	16.308	0.000