Paraben and Phthalate Exposure in Adolescents With Attention-Deficit/Hyperactivity Disorder: A Case-Control Study.

Area of Science:

• Environmental Health Sciences
• Neurodevelopmental Disorders
• Toxicology

Background:

• Attention-deficit/hyperactivity disorder (ADHD) is a prevalent neurodevelopmental disorder in adolescents.
• Exposure to endocrine-disrupting chemicals, such as parabens and phthalates, is widespread among adolescents.
• The relationship between ADHD and exposure to environmental chemicals requires further investigation.

Purpose of the Study:

• To compare urinary concentrations of parabens and phthalate metabolites in adolescents with ADHD versus healthy controls.
• To investigate whether product-use behaviors explain observed differences in chemical exposure.
• To explore the association between specific chemical exposures and ADHD status.

Main Methods:

• A case-control study involving 39 adolescents with ADHD and 41 healthy controls (aged 12-17 years).
• Quantification of seven parabens and ten phthalate metabolites in urine using high-performance liquid chromatography and gas chromatography-mass spectrometry.
• Statistical analyses included t-tests, multivariable logistic regression, ANCOVA, and mediation analyses, adjusting for covariates.

Main Results:

• Significant differences in urinary concentrations of certain parabens and phthalate metabolites were observed between ADHD and control groups.
• Dimethyl phthalate showed a notable association with ADHD status, though its low detection frequency warrants cautious interpretation.
• Personal care product use did not significantly mediate the relationship between ADHD status and chemical exposure levels.

Conclusions:

• Adolescents with ADHD exhibit altered internal exposure to specific parabens and phthalate metabolites.
• Findings suggest that observed exposure differences may be linked to behavior-related vulnerabilities during adolescence.
• Further longitudinal studies are necessary to elucidate the temporal and causal relationships between chemical exposures and ADHD.