Association between blood lead levels (<5μg/dL) and inattention-hyperactivity and neurocognitive profiles in school-aged Korean children

Yeni Kim, Soo Churl Cho, Bung Nyun Kim, Yun Chul Hong, Min Sup Shin, Hee Jeong Yoo, Jae Won Kim, Soo Young Bhang

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49 Scopus citations

Abstract

Objectives: The association between low blood lead levels (< 5 μg/dL) and the inattention-hyperactivity symptoms and neurocognitive profiles of school-aged Korean children was investigated. Methods: We measured blood lead levels in 256 Korean children aged 8-10. years. Teachers completed the Attention-Deficit Hyperactivity Disorder Rating Scale (T-ARS)-IV to assess inattentive and hyperactive symptoms. Parents completed the Korean version of the Learning Disability Evaluation Scale (K-LDES). Children performed neurocognitive tests [The Continuous Performance Test (CPT), the Children's Color Trails Test, and the Stroop Color and Word Test (SCWT)]. Results: A linear regression analysis indicated that the blood lead concentrations were associated with the inattention scores [. B=. 4.8, S.E.=. 1.6, 95% confidence interval (CI): 1.5-8.0], the hyperactivity subscores (3.1, 1.4, 0.3-5.9), and the total score (7.9, 2.9, 2.1-13.6) on the T-ARS; the number of omission errors on the CPT (20.6, 7.1, 6.5-34.6); the listening (-1.4, 0.7, -2.8 to -0.1), reading (-2.1, 0.7, -3.4 to -0.7), writing (-2.0, 0.7, -3.4 to -0.6), spelling (-2.2, 0.7, -3.7 to -0.7), and calculating (-1.8, 0.7, -3.1 to -0.4) scores on the K-LDES; and the color-word score on the SCWT (-6.7, 3.4, -13.3 to -0.1). A logistic regression analysis indicated that the probability of inattentive and hyperactive symptoms was increased with higher blood lead levels in boys with an odds ratio of 2.768 [. B=. 1.018, S.E.=. 0.487, p=. 0.036, 95% CI: 1.066-7.187]. Conclusion: This study suggests that even low blood lead levels (< 5 μg/dL) are associated with inattentive and hyperactivity symptoms and learning difficulties in school-aged children.

Original languageEnglish
Pages (from-to)5737-5743
Number of pages7
JournalScience of the Total Environment
Volume408
Issue number23
DOIs
StatePublished - 1 Nov 2010

Keywords

  • Children
  • Hyperactivity
  • Inattention
  • Lead
  • Learning

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