Table 2.

General characteristics the of this study population

Variables	Case	Control	p‐value
	(N = 279)	(N = 290)
Sex			0.823
Female	134 (48%)	142 (49%)
Male	145 (52%)	148 (51%)
Age, year(mean ± SD)	69.05 ± 9.732	56.13 ± 14.054	<0.05
Smoking			0.286
Yes	92 (33.3%)	84 (29.2%)
No	184 (66.7%)	204 (70.8%)

p‐values were calculated by Wald test and p < 0.05 indicates statistical significance.

Smoking (yes): including current smokers and former smoker; Smoking (no): including individuals who have never smoked regularly.