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Identifying periods of heightened susceptibility to lead exposure in relation to behavioral problems

Clara G Sears1,2, Bruce P Lanphear3, Yingying Xu4

  • 1Department of Epidemiology, Brown University, Providence, RI, USA. clara.sears@louisville.edu.

Journal of Exposure Science & Environmental Epidemiology
|November 3, 2021
PubMed

Insights

Lead exposure in children is linked to behavioral issues, with higher blood lead levels at age 8 showing the strongest adverse associations. Prevention efforts are crucial throughout childhood to mitigate these risks.

Area of Science:

  • Environmental Health
  • Pediatric Behavioral Science
  • Toxicology

Background:

  • Childhood lead exposure is a known risk factor for behavioral problems.
  • However, the specific ages during which children are most vulnerable to low-level lead exposure remain unclear.

Purpose of the Study:

  • To investigate the association between repeated blood lead concentrations and parent-reported behaviors in children.
  • To identify critical periods of heightened susceptibility to lead exposure during infancy and childhood.

Main Methods:

  • The HOME Study (Cincinnati, OH; 2003-2006; n=244) measured blood lead levels at ages 1, 2, 3, 4, 5, and 8 years.
  • Behavioral assessments were conducted using the Behavioral Assessment System for Children-2 (BASC-2) at ages 2, 3, 4, 5, and 8 years.
  • Statistical analyses included multiple informant models and modified Poisson regression to assess associations between blood lead levels and behavior scores.

Main Results:

  • Higher blood lead concentrations at all measured ages were associated with adverse behavioral scores.
  • The strongest associations were observed for blood lead levels at age 8 years, particularly on the Externalizing Problems and Adaptive Skills scales.
  • Increased risk for at-risk or clinically significant behavior scores was linked to higher blood lead concentrations across multiple BASC-2 scales.

Conclusions:

  • Contemporary lead exposure levels during the first 8 years of life are associated with ADHD-related behaviors, including aggression, hyperactivity, and conduct problems.
  • These findings underscore the critical importance of primary lead prevention strategies throughout childhood.
Abstract

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