Table 2.

Univariate and Multivariable Cox Proportional Model for Overall Survival

	Univariate HR (95% CI)	p-value1	Multivariable HR (95% CI)	p value
Age	1.03	<0.001	1.02	0.03
	(1.02 - 1.05)		(1.00 - 1.04)
Sex
Female vs. Male	0.7	0.02	0.75	0.07
	(0.51 - 0.95)		(0.55 - 1.03)
Charlson Deyo Score
1 or 2 vs. 0	1.45	0.02	1.45	0.02
	(1.06 - 1.99)		(1.05 - 2.02)
Insurance
Government vs. Private Insurance	1.4	0.03
	(1.02 - 1.91)
No insurance/unknown vs. Private Insurance	1.01	0.9
	(0.54 - 1.91)
Pathologic Stage - N
N1 vs. N0	1.55	0.009	1.48	0.02
	(1.12 - 2.16)		(1.05 - 2.08)
Histology
Adenocarcinoma vs. Squamous Cell Carcinoma	0.57	0.01	0.59	0.02
	(0.37 - 0.88)		(0.38 - 0.92)
Others vs. Squamous Cell Carcinoma	0.65	0.09	0.65	0.1
	(0.39 - 1.09)		(0.39 - 1.10)
Surgery
Pneumonectomy vs. Lobectomy	1.52	0.1
	(0.82 - 2.8)
Surgical Approach
Thoracotomy vs.VATS	1.2	0.3
	(0.78 - 1.85)
Radiation
Yes vs. No	0.89	0.6
	(0.58 - 1.37)
Chemotherapy
Yes vs. No	0.71	0.04	0.66	0.01
	(0.52 - 0.99)		(0.47 - 0.92)

Multivariable cox modeling was performed using patient age, sex, Charlson Deyo score, insurance type, tumor histology and pathologic N stage, surgery type, radiation therapy status, and adjuvant chemotherapy as covariates. All statistically significant variables (P < 0.05) are highlighted in bold.

¹Wald p