Secondary analysis from the Seychelles Child Development Study: the child behavior checklist

Area of Science:

• Environmental Health
• Neuroscience
• Developmental Psychology

Background:

• Methylmercury (MeHg) is a potent neurotoxin, with human exposure primarily occurring through fish consumption.
• Previous research indicated no adverse association between MeHg exposure and overall child behavior scores (CBCL Total T score).
• Understanding the impact of MeHg on specific behavioral aspects is crucial, especially in populations with high fish intake.

Purpose of the Study:

• To investigate the association between prenatal and postnatal methylmercury (MeHg) exposure and specific aspects of school-age behavior.
• To analyze the T scores of the Achenbach Child Behavior Checklist (CBCL) subscales in relation to MeHg exposure levels.
• To determine if discrete behavioral measures are linked to MeHg exposure in children from the Seychelles.

Main Methods:

• Utilized data from the Seychelles Child Development Study (SCDS), a prospective, double-blind, longitudinal study of over 700 children.
• Assessed prenatal MeHg exposure using maternal hair total mercury (T-Hg) during gestation.
• Measured postnatal MeHg exposure via child's hair T-Hg at 66 months and administered the CBCL to primary caregivers.

Main Results:

• No statistically significant associations were found between prenatal MeHg exposure and CBCL subscale scores.
• No statistically significant associations were observed between postnatal MeHg exposure and CBCL subscale scores.
• Analysis of discrete behavioral aspects using CBCL subscales revealed no link to MeHg exposure in this cohort.

Conclusions:

• In Seychellois children with high fish consumption, neither prenatal nor postnatal methylmercury (MeHg) exposure was associated with behavioral outcomes measured by CBCL subscales.
• The findings suggest that MeHg exposure, within the levels experienced by this population, does not adversely affect specific behavioral domains in school-aged children.
• This study contributes to understanding the neurodevelopmental effects of MeHg in populations with significant dietary fish intake.