Table 2.

Multivariate Cox proportional hazards regression model of OS for the 154 patients with CCUP

Variable	HR (95% CI)	P
N category
N1	1 (reference)	<0.001
N2 vs. N1	1.890 (1.017–3.512)	0.044
N3 vs. N1	7.243 (3.033–17.299)	<0.001
Lymph node ENE
Yes vs. no	2.157 (1.168–3.985)	0.014
Pathologic type
Squamous cell carcinoma vs. other types	1.977 (1.102–3.546)	0.022

HR, hazard ratio; CI, confidence interval.