Associations between soil lead concentrations and populations by race/ethnicity and income-to-poverty ratio in urban and rural areas |
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Authors: | C. Marjorie Aelion Harley T. Davis Andrew B. Lawson Bo Cai Suzanne McDermott |
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Affiliation: | 1. School of Public Health and Health Sciences, University of Massachusetts, 715 North Pleasant Street, Amherst, MA, 01003, USA 2. Department of Environmental Health Sciences, University of South Carolina, 921 Assembly Street, Columbia, SC, 29208, USA 3. Department of Epidemiology and Biostatistics, University of South Carolina, 800 Sumter Street, Columbia, SC, 29028, USA 4. Division of Biostatistics and Epidemiology, Medical University of South Carolina, 135 Cannon Street, Charleston, SC, 29401, USA 5. Department of Family and Preventive Medicine, University of South Carolina, 3209 Colonial Drive, Columbia, SC, 29203, USA
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Abstract: | Lead (Pb) is a well-studied environmental contaminant that has many negative health effects, especially for children. Both racial/ethnic and income disparities have been documented with respect to exposure to Pb in soils. The objectives of this study were to assess whether soil Pb concentrations in rural and urban areas of South Carolina USA, previously identified as having clusters of intellectual disabilities (ID) in children, were positively associated with populations of minority and low-income individuals and children (≤6 years of age). Surface soils from two rural and two urban areas with identified clusters of ID were analyzed for Pb and concentrations were spatially interpolated using inverse distance weighted analysis. Population race/ethnicity and income-to-poverty ratio (ITPR) from United States Census 2000 block group data were aerially interpolated by block group within each area. Urban areas had significantly higher concentrations of Pb than rural areas. Significant positive associations between black, non-Hispanic Latino, individuals and children ≤6 years of age and mean estimated Pb concentrations were observed in both urban (r = 0.38, p = 0.0007) and rural (r = 0.53, p = 0.04) areas. Significant positive associations also were observed between individuals and children with an ITPR < 1.00 and Pb concentrations, though primarily in urban areas. Racial/ethnic minorities and low ITPR individuals, including children, may be at elevated risk for exposure to Pb in soils. |
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