Table 1. Distribution of demographic factors and tobacco smoking in cases and controls.

Variable	Case (%)	Control (%)	P value
Age (years)	54.7±10.8	55.6±10.6	0.313
<41	43(12.6)	34(10.0)
41–50	66(19.4)	69(20.3)
51–60	110(32.4)	105(30.9)
>60	121(35.6)	132(38.8)	0.634
sex
Male	270(79.4)	264(77.6)
Female	70(20.6)	76(22.4)	0.575
Tobacco smoking
Ever	225(66.2)	165(48.5)
Never	115(33.8)	175(51.5)	<0.001