first baby hair lower in cases 0.47 1-2 y mercury levels ppm versus 3.63 ppm in controls Hair and [35] ASD 45 Lead and mercury in Significant elevation nails Biol Trace Elem Controls 50 hair and nails autism in the levels of Res vs. controls mercury in both hair 4-12 y and nail samples in autism vs. controls Hair Majewska et al. ASD 91 Levels of hair Autistic children [36] Controls 75 mercury in autism significantly differed Acta Neurobiol vs. controls from healthy peers Exp 3-9 y in the concentrations of mercury in hair Hair Elsheshtawy et al. The level of mercury ASD 32 Investigated the [37] was significantly relationship between Controls 32 Middle East lower in cases autism and mercury, Current Psychiatry (0.55±0.06 lead, copper, zinc μg/mg) 3-4 y than in controls (3.2±0.2 μg/mg) Hair Mohamed et al. ASD 100 Assess the levels and Hair mercury levels [41] Controls 100 possible were higher in Behav Neurol environmental risk children with ASD 2-15 y factors from metals than controls Hair Tabatadze et al. ASD 30 Evaluation levels of High contamination [42] Controls 30 essential trace to mercury in ASD Georgia Med elements and heavy children compared to News 4-5 y metals in ASD vs. controls controls Hair Adams et al. [43] ASD 78 First baby haircuts Children with lower Toxicol Environ Controls 31 evaluated for levels of mercury in Chem mercury and ASD hair were 2.5 times Born between more likely to have 1988-99 ASD
1-2 y first baby hair mercury levels lower in cases 0.47 ppm versus 3.63 ppm in controls Hair and nails [35] Biol Trace Elem Res ASD 45 Controls 50 4-12 y Lead and mercury in hair and nails autism vs. controls Significant elevation in the levels of mercury in both hair and nail samples in autism vs. controls Hair Majewska et al. [36] Acta Neurobiol Exp ASD 91 Controls 75 3-9 y Levels of hair mercury in autism vs. controls Autistic children significantly differed from healthy peers in the concentrations of mercury in hair Hair Elsheshtawy et al. [37] Middle East Current Psychiatry ASD 32 Controls 32 3-4 y Investigated the relationship between autism and mercury, lead, copper, zinc The level of mercury was significantly lower in cases (0.55±0.06 μg/mg) than in controls (3.2±0.2 μg/mg) Hair Mohamed et al. [41] Behav Neurol ASD 100 Controls 100 2-15 y Assess the levels and possible environmental risk factors from metals Hair mercury levels were higher in children with ASD than controls Hair Tabatadze et al. [42] Georgia Med News ASD 30 Controls 30 4-5 y Evaluation levels of essential trace elements and heavy metals in ASD vs. controls High contamination to mercury in ASD children compared to controls Hair Adams et al. [43] Toxicol Environ Chem ASD 78 Controls 31 Born between 1988-99 First baby haircuts evaluated for mercury and ASD Children with lower levels of mercury in hair were 2.5 times more likely to have ASD
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