Table 4. Prognostic factors related to recurrence-free survival using a Cox proportional-hazard regression model.

Clinicopathological factors	Variables	P value	Hazard ratio	95% confidence intervals
N classification	N2	0.02	4.49	1.31–14.35
3M/0M d-ROMs	High group†	0.02	5.61	1.43–19.49

^†, 3M/0M d-ROMs ≥1.458.