Effects of low-level prenatal lead exposure on child IQ at 4 and 8 years in a UK birth cohort study.

When the interaction term sex × prenatal B-Pb was added to the model 3 linear regression, the term was not significant in the models at age 4 years, but at age 8 years the interaction term was weakly significant for verbal, performance and total IQ (p = 0.071, 0.065 and 0.033, respectively; Table 1 ).

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