Table 3.

Univariate and multivariate Cox analyses of OS in training cohort.

Characteristics	Univariable analysis			Multivariable analysis
	HR	95% CI	P	HR	95% CI	P
Age			0.002			0.001
<60	1.000			1.000
60-70	0.698	0.313-1.556	0.379	0.674	0.299-1.521	0.342
>70	2.290	1.143-4.587	0.019	2.355	1.145-4.841	0.020
Gender			0.292
Male	1.000
Female	1.227	0.695-2.167	0.480
Pathologic stage			<0.001			<0.001
I	1.000			1.000
II	2.673	1.516-4.712	0.001	2.819	1.578-5.036	<0.001
Laterality			0.582
Right	1.000
Left	1.118	0.632-1.975	0.475
Unknown	0.991	0.134-7.343	0.993
Smoking history			0.375
Yes	1.000
No	1.195	0.610-2.341	0.603
BACH1 expression			<0.001			<0.001
High	1.000			1.000
Low	0.284	0.158-0.511	<0.001	0.315	0.174-0.571	<0.001