Variable Groups Case group Control group Student t test P value Zinc (Mean± SD) Male 75.04±22.57 108.3±9.68 6.27 0.001  HS Female 69.35±22.27 105.3±15.56 7.94 0.001  HS Lead (Mean± SD) Male 5.77±2.87 2.7±1.83 4.34 0.001  HS Female 5.85±2.9 2.14±1.34 6.66 0.001  HS

Table 1: Comparison between mean serum zinc and lead levels (μg/dL) in studied groups (case and control) regarding to sex.