Table 3. Multivariable exponential regression model for overall survival.

	estimate	sd	z	HR	95% CI Lower	95% CI Upper	p value
(Intercept)	7.82	0.38	20.6
Age (each 5 yrs)	-0.173	0.0264	-6.57	1.19	1.13	1.25	<0.001
Pleural Invasion (yes.vs.no)	-0.271	0.124	-2.19	1.31	1.03	1.67	0.029
Tumor Size
T1a (baseline group)	-	-	-	1.0	-	-
T1b	-0.298	0.137	-2.17	1.35	1.03	1.76	0.030
T2a	-0.481	0.138	-3.48	1.62	1.23	2.12	<0.001
T2b	-0.768	0.177	-4.34	2.16	1.52	3.05	<0.001
T3	-0.892	0.221	-4.03	2.44	1.58	3.77	<0.001
Performance status: some symptoms vs. normal	-0.272	0.103	-2.64	1.31	1.07	1.61	0.008
Performance status: < 50% of time in bed vs. normal	-1.09	0.305	-3.56	2.97	1.63	5.4	<0.001
Gender F vs. M	0.325	0.104	3.14	0.722	0.59	0.885	<0.001
Histology: Squamous vs. Adenocarcinomas	-0.203	0.121	-1.68	1.22	0.967	1.55	0.093
Histology: Other non-small cell vs. Adenocarcinomas	-0.0722	0.134	-0.537	1.07	0.826	1.4	0.592