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. 2006 Dec 18;115(4):630–635. doi: 10.1289/ehp.9389

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Mean blood lead concentrations of 142 children 1–8 years of age by age group, race, and season. Error bars depict SEs. Bars not marked by the same letter differ significantly (SAS-GLM, p < 0.05). Hispanic children: 1–3 years of age, n = 29; 4–8 years of age, n = 22. African-American children: 1–3 years of age, n = 49; and 4–8 years of age, n = 42.