Table 2.
Individual and group-level characteristics of children 9 months to 7 years of age who were screened for blood lead 1995–2003 (n = 125,197).
| Characteristic | Value | |
|---|---|---|
| Individual level | ||
| Blood lead level [µg/dL (mean ± SD)] | 3.88 ± 2.94 | |
| Season in which blood lead screening occurred [n (%)]a | ||
| Winter | 27,189 (21.72) | |
| Spring | 30,593 (24.44) | |
| Summer | 35,256 (28.16) | |
| Fall | 32,159 (25.69) | |
| Residential proximity to airport [n (%)] | ||
| Within 500 m | 1,267 (1.01) | |
| Within 1,000 m | 3,649 (2.92) | |
| Within 1,500 m | 8,122 (6.49) | |
| Within 2,000 m | 13,478 (10.77) | |
| > 2,000 m | 111,719 (89.23) | |
| Year residence of child built (mean ± SD) | 1970 ± 20.10 | |
| Group level (mean ± SD) | ||
| Proportion blackb | 0.39 ± 0.33 | |
| Proportion Hispanicb | 0.09 ± 0.15 | |
| Household median income ($10,000s)c | 4.38 ± 2.09 | |
| Proportion receiving public assistancec | 0.04 ± 0.05 | |
| aWinter: December–February; spring: March–May; summer: June–August; fall: September–November. bResolved at the census block level. cResolved at the census block group level. | ||