Evidence of associations of pre- and postnatal exposure to polychlorinated biphenyls (PCBs) with cognitive development beyond early childhood is inconsistent. A previous report from this cohort observed adverse associations between early life PCB exposures and infant Bayley scores at age 16 months. The present study examines pre- and postnatal PCB exposures in relation to both behavior and cognitive development at age 45 months. Participants were 472 mother-child pairs residing in an area of eastern Slovakia characterized by environmental contamination with PCBs, which resulted in elevated blood serum concentrations. PCB-153 and PCB-118 concentrations were measured in maternal and in infant 6-, 16-, and 45-month serum samples. At age 45 months, children were administered five subtests of the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-III), and mothers completed the Child Behavior Checklist (CBCL). Negative binomial and multiple linear regressions were used to estimate PCB-CBCL and PCB-WPPSI-III subtest score associations, respectively. Pre- and postnatal levels of PCB-153 and PCB-118 were not associated with cognitive performance on the WPPSI-III in this cohort. There was some suggestion that higher postnatal PCB concentrations were associated with more sleep problems and feelings of depression and anxiousness.

Department of Analytical Chemistry University of Vienna Vienna Austria

Department of Epidemiology Rollins School of Public Health Emory University Atlanta GA USA

Department of Public Health Sciences University of California Davis CA USA

Department of Public Health Sciences University of Rochester School of Medicine and Dentistry Rochester NY USA

Division of Nutritional Sciences Cornell University Ithaca NY USA

Research Centre for Toxic Compounds in the Environment Masaryk University Brno Czech Republic

Slovak Medical University Bratislava Slovakia

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