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An Industry-Relevant Metal Mixture, Iron Status, and Reported Attention-Related Behaviors in Italian Adolescents.
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- Author(s): Schildroth, Samantha; Kordas, Katarzyna; White, Roberta F.; Friedman, Alexa; Placidi, Donatella; Smith, Donald; Lucchini, Roberto G.; Wright, Robert O.; Horton, Megan; Henn, Birgit Claus
- Source:
Environmental Health Perspectives. Feb2024, Vol. 132 Issue 2, p027008-1-029001-1. 16p. - Source:
- Additional Information
- Subject Terms: RISK factors of attention-deficit hyperactivity disorder; IRON; IRON in the body; RISK assessment; ENVIRONMENTAL health; CROSS-sectional method; MANGANESE; SELF-evaluation; SYNDROMES; RESEARCH funding; FERRITIN; TRANSFERRIN; NEUROTOXICOLOGY; COPPER; HEMOGLOBINS; NEURAL development; MULTIPLE regression analysis; DESCRIPTIVE statistics; ITALIANS; TEENAGERS' conduct of life; CHROMIUM; LUMINESCENCE spectroscopy; IMPULSIVE personality; ENVIRONMENTAL exposure; MANUFACTURING industries; MASS spectrometry; RESEARCH; METALS; PUBLIC health; HAIR; IMMUNOASSAY; CONFIDENCE intervals; LEAD; BIOMARKERS; DISEASE risk factors; ADOLESCENCE
- Subject Terms:
- Abstract: BACKGROUND: Exposure to environmental metals has been consistently associated with attention and behavioral deficits in children, and these associations may be modified by coexposure to other metals or iron (Fe) status. However, few studies have investigated Fe status as a modifier of a metal mixture, particularly with respect to attention-related behaviors. METHODS: We used cross-sectional data from the Public Health Impact of Metals Exposure study, which included 707 adolescents (10–14 years of age) from Brescia, Italy. Manganese, chromium, and copper were quantified in hair samples, and lead was quantified in whole blood, using inductively coupled plasma mass spectrometry. Concentrations of Fe status markers (ferritin, hemoglobin, transferrin) were measured using immunoassays or luminescence assays. Attention-related behaviors were assessed using the Conners Rating Scales Self-Report Scale–Long Form, Parent Rating Scales Revised–Short Form, and Teacher Rating Scales Revised–Short Form. We employed Bayesian kernel machine regression to examine associations of the metal mixture with these outcomes and evaluate Fe status as a modifier. RESULTS: Higher concentrations of the metals and ferritin were jointly associated with worse self-reported attention-related behaviors: metals and ferritin set to their 90th percentiles were associated with 3.0% [β= 0.03; 95% credible interval (CrI): -0.01, 0.06], 4.1% (β= 0.04; 95% CrI: 0.00, 0.08), and 4.1% (β= 0.04; 95% CrI: 0.00, 0.08) higher T-scores for self-reported attention deficit/hyperactivity disorder (ADHD) index, inattention, and hyperactivity, respectively, compared with when metals and ferritin were set to their 50th percentiles. These associations were driven by hair manganese, which exhibited nonlinear associations with all self-reported scales. There was no evidence that Fe status modified the neurotoxicity of the metal mixture. The metal mixture was not materially associated with any parent-reported or teacher-reported scale. CONCLUSIONS: The overall metal mixture, driven by manganese, was adversely associated with self-reported attention-related behavior. These findings suggest that exposure to multiple environmental metals impacts adolescent neurodevelopment, which has significant public health implications. [ABSTRACT FROM AUTHOR]
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