Distribution of HM exposure by gender (n=450) Gender HMs exposure Male (n=225) Female (n=225) Total (n=450) p No% No% No% Yes * 86 38.20 99 44.00 185 41.10 0.213 No 139 61.80 126 56.00 265 58.90 *: B-Pb ≥ 10 g / dL or U-As > 60 or U-ALA ≥ 5 mg / L 41.10% of local people had HM exposure, however there was no difference in HM exposure rate by gender (p>0.05).