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Assessing the Relation between Plasma PCB Concentrations and Elevated Autistic Behaviours using Bayesian Predictive

Brendan A Bernardo1, Bruce P Lanphear2, Scott A Venners3

  • 1Faculty of Health Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada. brendan_bernardo@sfu.ca.

International Journal of Environmental Research and Public Health
|February 16, 2019
PubMed
Summary
This summary is machine-generated.

Prenatal exposure to polychlorinated biphenyls (PCBs) was not definitively linked to autistic behaviors in children. While some small, imprecise increases in autistic behaviors were observed at higher PCB levels, no clear association was found.

Keywords:
autismchildrenenvironmental chemicalsneuro-developmentpolychlorinated biphenyls

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Area of Science:

  • Environmental Health
  • Neurodevelopmental Disorders
  • Toxicology

Background:

  • Autism spectrum disorder (ASD) is a neurodevelopmental condition impacting social communication and behavior.
  • In utero exposure to environmental chemicals, like polychlorinated biphenyls (PCBs), is a potential factor in ASD etiology.
  • Understanding environmental influences on neurodevelopment is crucial for public health.

Purpose of the Study:

  • To investigate the relationship between maternal plasma polychlorinated biphenyl (PCB) concentrations during pregnancy and autistic behaviors in children.
  • To assess the association using both continuous and binary measures of autistic behaviors.
  • To contribute to the understanding of environmental chemical impacts on child neurodevelopment.

Main Methods:

  • Analysis of plasma PCB concentrations from the first trimester in 546 mother-infant pairs from the MIREC Study.
  • Quantification of 6 specific PCB congeners detected in over 40% of samples.
  • Caregiver completion of the Social Responsiveness Scale-2 (SRS) for children aged 3-4 years to measure autistic behaviors.

Main Results:

  • No clear evidence of an association between maternal plasma PCB concentrations and autistic behaviors was found.
  • Small, imprecise increases in mean SRS scores and odds of more autistic behaviors were observed for the highest PCB exposure categories.
  • For PCB138, the highest exposure category showed an average SRS increase of 1.4 (95%PCI: -0.4, 3.2) and an odds ratio of 1.8 (95%PCI: 1.0, 2.9) for more autistic behaviors.

Conclusions:

  • The study found no definitive link between prenatal PCB exposure and autistic behaviors in children.
  • Findings highlight the importance of examining associations using both continuous and binary outcome scales.
  • Further research is needed to clarify the complex relationship between environmental exposures and neurodevelopmental outcomes.