Table 1.

Characteristics of the study population

Variable		n	%
Occupation	Dental Technician	16	17,8
	Foundry Worker	10	11,1
	Construction Worker	2	2,2
	Welder	2	2,2
	Sandblaster	6	6,7
	Coal Miner	35	38,9
	Marble worker	5	5,6
	Ceramic Worker	4	4,4
	Quarry mill worker	6	6,6
	Tunnel Worker	4	4,4
Smoking Status	Smoker	32	35,6
	Non-smoker	21	23,3
	Ex|-smoker	37	41,1
Exposure time (year)	0-3	5	5,6
	4-9	11	12,2
	10-19	26	28,9
	≥20	48	53,3
Large Opacity	A	37	41,1
	B	26	28,9
	C	27	30,0
ILO Category	Category 1	9	10,0
	Category 2	46	51,1
	Category 3	35	38,9
Dominant Small Opacity	p	3	3,3
	q	39	43,3
	r	36	40
	s	3	3,3
	t	9	10