Table I.

Comparison of general data between the two groups (mean ± SD) [n (%)].

Characteristic	Study group	Control group	Chi-square test	P-value
Sex			0.189	0.663
Male	55	51
Female	24	19
Age (years)			0.502	0.479
≤50	44	43
>50	35	27
Average age (years)	52.87±5.12	52.09±5.78	0.874	0.384
Dust exposure duration (years)	7.92±1.21	8.01±1.18	0.458	0.647
Smoking			0.237	0.626
Yes	42	40
No	37	30
Stage			0.012	0.994
I	47	42
II	26	23
III	6	5