Table 5. Cox multiple regression for overall survival.

Factor	Hazard ratio	95% CIa	P-value
Growth pattern			0.007
Destructive	1
Papillary	1.977	1.169–3.345	0.011
Alveolar	1.825	1.117–2.980	0.016
N-status			0.001
N0	1
N1	1.969	1.244–3.118	0.035
N2	2.961	1.526–5.748	0.009
Age	1.029	1.005–1.054	0.020
Type of operation
(bi)lobectomy	1
Pneumonectomy	1.530	0.989–2.369	0.056

^a95% CI=95% confidence interval.