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Type: Journal article
Title: Low-level environmental lead exposure still negatively associated with children's cognitive abilities
Author: Earl, R.
Burns, N.
Nettelbeck, T.
Baghurst, P.
Citation: Australian Journal of Psychology, 2016; 68(2):98-106
Publisher: Wiley
Issue Date: 2016
ISSN: 0004-9530
Statement of
Rachel Earl, Nicholas Burns, Ted Nettelbeck, and Peter Baghurst
Abstract: Objective: We explored relationships between children's cognitive abilities measured with the Wechsler Intelligence Scale for Children-Fourth Edition and blood lead levels. Methods: Participants were 127 children (mean age = 7.9 years, standard deviation = 0.6) from Australian cities, Port Pirie, and Broken Hill, with low-level blood lead concentrations (mean = 4.8 microgram/decilitre, standard deviation = 3.3, range = 1.0–19.3). Potential covariates (demographic, parental, familial, psycho-social, pre- and post-natal factors) were controlled statistically. Results: Unadjusted analyses found moderate, continuous, and statistically significant inverse, non-linear associations between blood lead level and three of the four cognitive indices that combine to deliver Full Scale IQ. In addition to blood lead level, variables that consistently explained most variance in cognitive performance were breastfeeding up to 6 months and stressful life events reported within the family for the past 12 months. In multiple regression analyses, after controlling for these, blood lead level remained a significant predictor of cognitive outcomes. Conclusion: These results support the hypothesis that blood lead levels below 10 micrograms/decilitre may still have a detrimental impact on children's cognitive abilities, supporting recent concern that there is no safe level of paediatric lead exposure.
Keywords: children; cognitive abilities; cognitive development; environmental risk; IQ; lead
Rights: © 2015 The Australian Psychological Society
RMID: 0030036551
DOI: 10.1111/ajpy.12096
Grant ID:
Appears in Collections:Psychology publications

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