Table 1 | Characteristic of the reference..

characteristic	Reference group			Exposed group
characteristic	N	Rang	Mean ± SD	N	Rang	Mean ± SD
Number	42	-	-	42	-	-
Age(year)	-	18 - 64	41.16 ± 2.08	-	19 - 65	43.28 ± 1.98
Smokers	-	-	-	28	-	-
Duration of employment(year)	-	-	-	-	2 - 48	25.52 ± 1.93

Table 1: Characteristic of the reference and exposed groups.

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