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Gender difference in the effects of lead exposure at different time windows on neurobehavioral development in
Hyunjoo Joo1, Jong Hyuk Choi1, Eunae Burm2
1Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Republic of Korea.
Insights
Lead exposure affects children's behavior, with prenatal exposure impacting males more and postnatal exposure affecting females more. This highlights critical windows for lead toxicity intervention in children.
Area of Science:
- Environmental Health
- Neurodevelopmental Pediatrics
- Toxicology
Background:
- The link between lead exposure and child neurodevelopment is established, but gender-specific effects require further investigation.
- Understanding gender differences in lead's neurobehavioral impact is crucial for targeted interventions.
Purpose of the Study:
- To examine lead exposure's effects on neurobehavioral development in 5-year-old children.
- To identify vulnerable exposure time windows and potential gender differences in lead's impact.
Main Methods:
- Prospective birth cohort study (Mothers and Children's Environmental Health study) involving 1751 mother-child pairs.
- Blood lead levels measured in mothers (early/late pregnancy) and children (birth, 2, 3, 5 years).
- Behavioral assessment using the Korean Child Behavior Checklist in 575 children; analysis via generalized linear models.
Main Results:
- Prenatal lead exposure (late pregnancy) linked to increased behavioral problems in males.
- Postnatal lead exposure (2 and 5 years) associated with increased behavioral risks in females.
- Females showed stronger effects in attention and sleep problems with increased blood lead levels.
Conclusions:
- Lead toxicity impacts children's neurobehavioral development differently based on gender.
- Males are more vulnerable to prenatal lead exposure, while females are more susceptible to postnatal exposure.
- Findings emphasize gender-specific vulnerabilities to lead exposure, particularly concerning attention and sleep.
Background:
Although the association between lead exposure and children's neurodevelopment has been studied, gender differences remain to be investigated. We examined the effects of lead exposure on the neurobehavioral development of 5-year-old children to identify the vulnerable time window of exposure and potential gender difference.
Method:
A total of 1751 pregnant women and children participated in the prospective birth cohort study, Mothers and Children's Environmental Health study, since 2006. Lead levels were measured in the maternal blood in early and late pregnancies, in cord blood at birth, and in 2-, 3-, and 5-year-old children's blood. The behavior of 575 children aged 5years were assessed using the Korean Child Behavior Checklist. The association between the blood lead level at each time window and behavior was examined using a generalized linear model adjusted for potential confounders and covariates.
Results:
Lead levels at late pregnancy were significantly associated with increased risk of behavioral problems in males. Lead levels in 2- and 5-year-old children's blood significantly increased behavioral risks in females: for a 1-μg/dL increase in blood lead levels, the score for total behavioral problems increased by 3.00 (95% confidence interval [CI]: 0.56-5.45) during the late pregnancy in males, whereas it increased by 3.82 (95% CI: 1.25-6.39) at 2years and by 5.72 (95% CI: 0.44-10.99) at 5years in females with a stronger effect in attention and sleep problems.
Conclusion:
Effects of lead toxicity on children's neurobehavioral development showed gender differences. Males were more susceptible to prenatal exposure, while females were more susceptible to postnatal exposure with stronger effects in attention and sleep problems.
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