Conversely, lower Pb levels (< 4.5 μg/g) were associated with ASD (OR = 0.164, 95 % CI: 0.0215–0.980; p = 0.0569), although this result approached marginal significance.
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Heavy metals exposure and risk factors for autism spectrum disorder (ASD) among school children in Makassar City, Indonesia.
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Prenatal tobacco smoke exposure also approached significance in correlating with child Hg levels, hinting at combined toxicological stresses on neurodevelopment [6] , [13] .