Nested case-control study on the effects of prenatal exposure to PCBs

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Environmental exposures to polychlorinated biphenyls (PCBs) have been suggested as a risk factor for neurobehavioral development in children. A nested case-control study was performed to investigate the association between the cognitive outcome at 42 months and the prenatal exposures to PCB and DDE. The Tohoku Study of Child Development cohort contains cord blood samples collected at the delivery of healthy pregnant women of the Tohoku district of east Japan. The cognitive score was assessed with the Kaufman Assessment Battery for Children (K-ABC). After adjusting with maternal IQ, maternal age, gestational days, maternal fish intake, plasma omega-3/omega-6 polyunsaturated fatty acids, and others, no statistically significant association with the cognitive and simultaneous processing scores was seen for any PCB and DDE.