TABLE 1—
Weighted Individual-, Household-, and Neighborhood-Level Characteristics: Birth Cohort of the Project on Human Development in Chicago Neighborhoods, Chicago, IL, 1995–2013
| Characteristic | Unweighted No. | Weighted Mean or Proportion (SD) |
| Average BLL (µg/dL) when younger than 6 y | 208 | 6.14 (4.58) |
| Age, wave 4 | 208 | 17.00 (0.50) |
| Gender | ||
| Female | 111 | 0.54 |
| Male | 97 | 0.46 |
| Race/ethnicity | ||
| White | 26 | 0.12 |
| Black | 78 | 0.49 |
| Hispanic | 93 | 0.34 |
| Other | 11 | 0.05 |
| Caregiver immigrant generation | ||
| ≥ third generation | 106 | 0.63 |
| Second generation | 25 | 0.07 |
| First generation | 77 | 0.30 |
| Caregiver marital status, wave 1 | ||
| Married | 95 | 0.42 |
| Single | 75 | 0.40 |
| Cohabiting | 38 | 0.19 |
| Caregiver education level, wave 1 | ||
| < high school | 81 | 0.42 |
| High school or GED | 30 | 0.17 |
| > high school | 73 | 0.32 |
| ≥ bachelor’s degree | 24 | 0.09 |
| Caregiver receives TANF, wave 1 | ||
| No | 117 | 0.55 |
| Yes | 91 | 0.45 |
| % block group non-Hispanic Black, 1990 | 208 | 0.47 (0.46) |
| % block group Hispanic, 1990 | 208 | 0.22 (0.29) |
| % block group below poverty level, 1990 | 208 | 0.25 (0.22) |
| % block group with BLL test, 1995–1997 average (centered) | 208 | 0.02 (0.36) |
| Impulsivity, wave 4 (standardized) | 208 | 0.05 (1.04) |
| Anxiety or depression, wave 4 (standardized) | 208 | 0.08 (1.10) |
| BMI, wave 4, kg/m2 | 208 | 23.68 (5.33) |
Note. BLL = blood lead level; BMI = body mass index; GED = general equivalency diploma; TANF = Temporary Assistance for Needy Families.