Dyslexia is associated with urinary polycyclic aromatic hydrocarbon metabolite concentrations of children from China: Data from the READ program

• Published in: Environmental pollution (1987) 2024-04, Vol.346, p.123538-123538, Article 123538
• Main Authors: Feng, Yanan, Wan, Yanjian, Wang, Haoxue, Jiang, Qi, Zhu, Kaiheng, Xiang, Zhen, Liu, Rundong, Zhao, Shuai, Zhu, Ying, Song, Ranran
• Format: Article
• Language: English
• Subjects: 2-OHNap; Biomarkers - urine; Case-Control Studies; Case-control study; Child; China - epidemiology; Dyslexia; Environmental Exposure - analysis; Humans; Logistic Models; Polycyclic aromatic hydrocarbon; Polycyclic Aromatic Hydrocarbons - analysis
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2024.123538

It has been found that exposure to polycyclic aromatic hydrocarbons (PAHs) is associated with the risk of certain childhood neurodevelopmental disorders. However, no research has investigated the relationship between exposure to PAHs and children's dyslexia odds. The objective of this research was to investigate whether urinary mono-hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) are associated with increased dyslexia odds in Chinese children. We recruited 1,089 children (542 dyslexic children and 547 non-dyslexic children) for this case-control study. Ten OH-PAHs were measured in the participants' urine samples, which were collected between November 2017 and March 2023. Odds ratios (ORs) of the associations between the OH-PAHs and dyslexia were calculated using logistic regression models, after adjustment for the potential confounding factors. A significant association was found between urinary concentrations of 2-hydroxynaphthalene (2-OHNap) and the elevated odds of dyslexia. The children in the highest quartile of 2-OHNap had a higher OR of dyslexia (1.87, 95% CI: 1.07–3.27) than those in the lowest quartile (P-trend = 0.02) after adjustment for the covariates. After excluding children with maternal disorders during pregnancy, logistic regression analyses showed similar results. Our results suggested a possible association between PAH exposure and the elevated odds of dyslexia. [Display omitted] •Ten mono-hydroxylated polycyclic aromatic hydrocarbons were detected in this study.•The urine samples of 542 dyslexics and 547 non-dyslexics were collected from four cities in China.•Urinary 2-OHNap was positively associated with dyslexia odds.