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Prenatal exposure to low-level polychlorinated biphenyls in relation to mental and motor development at 8 months
Julie L Daniels1, Matthew P Longnecker, Mark A Klebanoff
1Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA. Julie_Daniels@unc.edu
Insights
Prenatal exposure to polychlorinated biphenyls (PCBs) showed no overall effect on infant cognitive or motor development. However, the association between PCBs and motor skills varied significantly across different study centers, with unclear reasons for this discrepancy.
Area of Science:
- Environmental Health
- Neurodevelopmental Pediatrics
- Toxicology
Background:
- Polychlorinated biphenyls (PCBs) are persistent organic pollutants with potential neurotoxic effects.
- Previous studies on PCBs and child neurodevelopment have yielded inconsistent results.
- Understanding the impact of low-level prenatal PCB exposure is crucial for public health.
Purpose of the Study:
- To evaluate the association between prenatal exposure to polychlorinated biphenyls (PCBs) and neurodevelopment in young children.
- To investigate potential variations in this association across different geographical study sites.
- To contribute to the understanding of environmental influences on early childhood development.
Main Methods:
- Utilized data from the Collaborative Perinatal Project (1959-1965).
- Measured PCBs in maternal serum during pregnancy.
- Assessed children's mental and psychomotor development at 8 months using the Bayley Scales of Infant Development.
Main Results:
- No significant overall association was found between prenatal PCB exposure and children's mental or psychomotor scores.
- A statistically significant variation (p < 0.05) in the PCB-psychomotor score relationship was observed across study centers.
- The direction of the association between PCBs and psychomotor scores differed between centers, with no clear explanation.
Conclusions:
- Overall prenatal PCB exposure did not appear to impact infant neurodevelopment in this cohort.
- The observed center-specific variations in the PCB-motor development relationship warrant further investigation.
- The underlying reasons for inconsistent findings in PCB neurodevelopment studies remain elusive.
Abstract:
The relation between exposure to low levels of polychlorinated biphenyls (PCBs), a class of persistent organic pollutants, and cognitive and motor development in young children has been examined in several studies, and results have varied. The authors evaluated the association between prenatal exposure to PCBs and children's neurodevelopment using data from the Collaborative Perinatal Project. Pregnant women were enrolled from 1959 to 1965 from 12 sites across the United States. PCBs were measured in maternal serum taken during pregnancy. To measure children's mental and psychomotor development at 8 months of age, the authors administered the Bayley Scales of Infant Development (means, 87 (standard deviation, 15) and 88 (standard deviation, 18), respectively). Overall, they did not observe a relation between prenatal PCB exposure and children's mental or psychomotor scores (n = 1,207; multivariate adjusted beta = 0.1 point per micro g/liter increase of PCB, p = 0.71, and beta = 0.5, p = 0.14, respectively). The PCB-psychomotor score relation varied by study center (p < 0.05): The association was direct in some centers, inverse in others. This could not be attributed to variation in the timing or measurement of the child's neurodevelopment or analysis of PCBs because these were standardized across centers. The reasons for variation in results within this study and across other studies remain unclear.