Table 4.

Factors Associated with Overall Survival

Variables	N	Multivariable cox regression
		HR	95% C.I for HR		P value
		HR	Lower	Upper	P value
Pathological N stage					<0.001
N0^*	301	1.00
N1	101	1.13	0.81	1.58	0.465
N2	413	1.98	1.57	2.48	<0.001
Type of lung resection					0.005
Lobectomy or sublobar resection^*	726	1.00
Pneumonectomy	96	1.51	1.13	2.00
Type of Adjuvant therapy					<0.001
None^*	384	1.00
Chemotherapy	138	0.63	0.48	0.82	0.001
Radiation therapy	204	0.80	0.62	1.02	0.077
Chemoradiation	71	0.51	0.35	0.74	<0.001
Completeness of resection					0.001
R0^*	742	1.00
R1–R2	80	1.66	1.24	2.23

Reference group; HR indicates the hazard ratio; CI, confidence interval.