Table 1 Demographic characteristics, mean blood lead concentrations, reading and math ISAT scores of Chicago cohort
Characteristic | n (%) | B-Pb (μg/dL) mean ± SD | Reading score ISAT mean ± SD | Math score ISAT mean ± SD | Reading failure % | Math failure % |
|---|---|---|---|---|---|---|
Overall | 47,168 (100) | 4.81 ± 2.22 | 154.9 ± 14.8 | 156.9 ± 14.2 | 14.6 | 14.5 |
Gender | ||||||
Male | 23,746 (50) | 4.85 ± 2.23 | 153.3 ± 14.8 | 156.6 ± 14.7 | 18.0 | 16.5 |
Female | 23,413 (50) | 4.77 ± 2.21 | 156.5 ± 14.6 | 157.2 ± 13.7 | 11.1 | 12.4 |
Race/Ethnicity | ||||||
Non-Hispanic black | 30,020 (64) | 5.25 ± 2.20 | 152.5 ± 14.2 | 152.5 ± 14.2 | 17.9 | 18.8 |
Hispanic | 13,067 (28) | 4.16 ± 2.03 | 157.6 ± 13.9 | 160.6 ± 13.4 | 9.6 | 7.5 |
Non-Hispanic white | 4,081 (9) | 3.72 ± 2.01 | 164.6 ± 15.9 | 167.2 ± 15.8 | 6.2 | 6.3 |
Mother’s education | ||||||
Some high school | 19,233 (41) | 5.09 ± 2.22 | 152.0 ± 13.9 | 154.3 ± 13.4 | 18.5 | 18.2 |
High school graduate | 16,101 (34) | 4.86 ± 2.23 | 154.4 ± 14.2 | 156.3 ± 13.8 | 14.4 | 14.5 |
Some college | 8,554 (18) | 4.49 ± 2.14 | 158.1 ± 14.6 | 159.6 ± 14.0 | 10.1 | 9.8 |
College graduate | 2,274 (5) | 3.88 ± 1.94 | 164.7 ± 15.4 | 166.5 ± 15.0 | 4.9 | 4.9 |
Post college | 1,006 (2) | 3.77 ± 1.92 | 169.2 ± 15.9 | 171.1 ± 15.6 | 3.6 | 2.8 |
Low-income | ||||||
Yes | 41,289 (88) | 4.93 ± 2.22 | 153.6 ± 14.1 | 155.6 ± 13.5 | 15.7 | 15.5 |
No | 5,879 (12) | 3.98 ± 2.02 | 164.0 ± 16.3 | 165.9 ± 15.9 | 7.0 | 7.0 |
Very low birthweight/early preterm | ||||||
Yes | 1,955 (4) | 5.12 ± 2.25 | 151.7 ± 14.3 | 152.8 ± 13.6 | 20.0 | 21.5 |
No | 45,213 (96) | 4.80 ± 2.21 | 155.1 ± 14.8 | 157.1 ± 14.2 | 14.4 | 14.2 |