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. 2015 Mar 10;123(8):827–833. doi: 10.1289/ehp.1408554

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Mean ± SD child IQ scores according to sextiles of (A) prenatal mercury and (B) prenatal lead. Based on Fisher’s Least Significance Difference tests, estimated mean IQ scores are significantly lower for all sextiles of prenatal mercury relative to the estimated mean for the lowest exposure group (all p < 0.005). Estimated mean IQ scores are significantly higher for the first through fourth sextiles of prenatal lead relative to the highest exposure group (all p < 0.05).