Table 1.

Demographic characteristics and occupational histories of participants.

	Control group(n = 94)	Lead-exposed group(n = 144)	P value
Age, years	42.2 ± 7.8	37.7 ± 8.2	0.049
Sex
Men	67 (71.3)	112 (77.8)	0.256
Smoking status
Yes	25 (26.6)	51 (35.4)	0.154
Alcohol drinker
Yes	21 (22.3)	39 (27.1)	0.410
Work years	7.7 ± 3.7	4.3 ± 2.5	<0.001

Data are expressed as mean ± standard deviation or n (%).