Table 1.
Clinical and demographic characteristics of the sample
| Clinical and demographic characteristics | Mean (SD) (range) or % | |||
|---|---|---|---|---|
| Age (years) | 8.2 (1.8) | |||
| (5.1–12.9) | ||||
| Female | 47.9 | |||
| Right-handed | 91.48 | |||
| Pb (µg/dl) | 2.75 (1.29) | |||
| (0.93–12.94) | ||||
| Fe (ng/ml) | 5622.70 (866.13) | |||
| (3450.00–8142.92) | ||||
| hPEPT2*2 | Wild type | Heterozygous | Homozygous | |
| 55.9 | 38.9 | 5.2 | ||
| ALAD2 | Wild type | Heterozygous | Homozygous | |
| 91.2 | 8.8 | 0 | ||
| Annual family income | ||||
| <10 K | 55.1 | |||
| 10 K–20 K | 36.3 | |||
| 20 K–30 K | 4.5 | |||
| >30 K | 4.1 | |||
| Size of household | 4.94 (1.53) | |||
| (2–10) | ||||
| Exposed to second-hand smoke in household | 4.7 | |||
| Parent level of education | Mother | Father | ||
| Completed grades 1–6 | 32.1 | 32.3 | ||
| Some high school | 25.0 | 22.9 | ||
| High school graduate | 23.4 | 29.7 | ||
| Attended college | 13.1 | 8.9 | ||
| Attended graduate school | 6.4 | 5.7 | ||
| Parent ethnicity | ||||
| African–American | 0.40 | 1.5 | ||
| Mexican/Mexican–American | 47.0 | 50.2 | ||
| Hispanic | 50.6 | 44.3 | ||
| Latino | 2.0 | 2.5 | ||
| Anglo-American | 0 | 1.5 | ||
| Parent race | ||||
| White | 99.6 | 98.5 | ||
| Black | 00.4 | 01.5 | ||
Age, sex, handedness, blood lead level (µg/dl), blood iron level (mcg/l), and ALAD2 and hPEPT2*2 status were available for 306 children; other clinical and demographic data were available for 81.4% (249 of 306) of children studied; and 19% (57 of 306) of parents chose not to provide demographic information