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Table 3 Log binomial regression models for the effect of blood lead concentration (B-Pb) on reading failure and math failure

From: The impact of low-level lead toxicity on school performance among children in the Chicago Public Schools: a population-based retrospective cohort study

   All children (n = 46,796) NH white children (n = 4,064) NH black children (n = 29,736) Hispanic children (n = 12,996)
Comparison   RR 95% CI RR 95% CI RR 95% CI RR 95% CI
Reading failure          
Unadjusted B-Pb (μg/dL) 1 μg/dL increase 1.12 1.11, 1.13 1.17 1.11, 1.23 1.08 1.07, 1.09 1.09 1.06, 1.12
5 μg/dL increase 1.74 1.66, 1.83 2.19 1.67, 2.87 1.45 1.37, 1.53 1.54 1.36, 1.75
Adjusteda,b B-Pb (μg/dL) 1 μg/dL increase 1.06 1.05, 1.07 1.14 1.08, 1.20 1.05 1.04, 1.06 1.08 1.05, 1.11
5 μg/dL increase 1.32 1.26, 1.39 1.93 1.47, 2.54 1.28 1.21, 1.35 1.47 1.29, 1.66
Math failure          
Unadjusted B-Pb (μg/dL) 1 μg/dL increase 1.13 1.12, 1.14 1.15 1.09, 1.22 1.08 1.07, 1.09 1.09 1.06, 1.13
5 μg/dL increase 1.84 1.76, 1.93 2.03 1.51, 2.73 1.47 1.39, 1.55 1.58 1.37, 1.82
Adjusted B-Pb (μg/dL) 1 μg/dL increase 1.06 1.05, 1.07 1.11 1.05, 1.18 1.05 1.04, 1.06 1.09 1.06, 1.12
5 μg/dL increase 1.32 1.26, 1.39 1.71 1.26, 2.30 1.28 1.22, 1.35 1.51 1.31, 1.75
  1. Model Summaries are for Children with B-Pbs Lower than 10 μg/dL, Overall and Stratified by Race/Ethnicity.
  2. aFor All Races, model includes blood lead concentration (<10 μg/dL), gender, mother’s education, low-income, very low birth weight/preterm, child’s age at time of B-Pb, ISAT vs. Iowa, and race (black vs. white and Hispanic vs. white).
  3. bFor individual races, model includes blood lead concentration, gender, mother’s education, low-income, very low birth weight/preterm, child’s age at time of B-Pb, ISAT vs Iowa.