. Author manuscript; available in PMC: 2015 Dec 1.

Published in final edited form as: Ann Surg Oncol. 2015 Mar 18;22(13):4392–4401. doi: 10.1245/s10434-015-4499-y

TABLE 2.

Comparison of hazard ratios by proposed N stage in all cases

N stage	HR^a (95 % CI)	HR^a (95 % CI)	p value^c	HR^b (95 % CI)	HR^b (95 % CI)	p value^c
N0	1.0	0.5 (0.3–0.7)	<0.0001	1.0	0.6 (0.4–0.9)	0.018
N1	2.1 (1.4–3.0)	1.0		1.6 (1.1–2.4)	1.0
N2	3.0 (1.9–4.6)	1.4 (0.9–2.2)		1.9 (1.1–3.2)	1.2 (0.7–2.0)

CI confidence interval, HR hazard ratio

HR based on Cox proportional hazard model only, including N stage

HR based on Cox proportional hazard model adjusting for age, sex, invasion size, T stage, surgical margin, site specific lassification

p value based on Chi square test (Wald test)