Table 4. Patient characteristics and clinical features.

Variables	Patients, n(%)(N = 242)	Deaths(n = 185)	MST (month)	Log-rank P	HR(95%CI)*
Age
≤65	113(46.7)	83	16.5	0.034	Reference
>65	129(53.3)	102	11.7		1.37(1.02–1.83)
Smoking
Never	17(7.0)	13	11.3		Reference
Former	142(58.7)	109	13.5	0.802	0.93(0.53–1.66)
Current	83(34.3)	63	13.4		0.85(0.47–1.56)
Histology
Adenocarcinoma	81(33.5)	59	15.0		Reference
SCC	75(31.0)	55	15.8	0.060	0.87(0.60–1.26)
Others†	86(35.5)	71	10.8		1.31(0.93–1.85)
Stage
IIIA	63(26.0)	42	18.9		Reference
IIIB	61(25.2)	44	14.7	0.001	1.25(0.82–1.91)
IV	118(48.8)	99	10.7		1.87(1.30–2.69)
Surgery
No	171(70.7)	128	12.7	0.088	Reference
Yes	71(29.3)	57	15.0		0.76(0.56–1.04)
Chemotherapy
No	59(24.4)	44	11.0	0.249	Reference
Yes	183(75.6)	141	13.7		0.82(0.58–1.15)
Radiotherapy
No	132(54.5)	98	12.5	0.308	Reference
Yes	110(45.5)	87	15.0		0.86(0.64–1.15)

Abbreviations: MST, median survival time; SCC, Squamous cell carcinoma; HR, hazard ratio.

^*Data were calculated by univariate cox regression analysis.

^†Others include large cell, bronchioalveolar, mixed cell, undifferentiated and pathologic not otherwise specified carcinomas.