Table 2 BLLs (μg/dL) in NLM children 0–12 years by residential distance from smelter, soil lead concentration (1992) and age group.
Indicator | N | Min, max (range) | Geometric mean (± 95% CIs) | Median (25th, 75thpercentiles) |
|---|---|---|---|---|
Distance | ||||
0 – < 1 km | 558 | 1, 38 (37) | 10.83 (10.36 – 11.32) | 11 (8, 16) |
1 – < 1.5 km | 980 | 1, 36 (35) | 8.76 (8.49 – 9.04) | 9 (6, 12) |
1.5 – < 2 km | 812 | 2, 35 (33) | 7.28 (7.05 – 7.52) | 7 (5, 10) |
2 – < 2.5 km | 275 | 1, 44 (43) | 6.90 (6.41 – 7.43) | 7 (5, 10) |
≥ 2.5 km | 141 | 1, 26 (25) | 6.24 (5.67 – 6.86) | 6 (5, 9) |
Soil lead (1992 soil survey) | ||||
Resident outside soil survey area | 201 | 1, 38 (37) | 6.08 (5.61 – 6.59) | 6 (4, 9) |
0 – < 150 ppm | 201 | 2, 35 (33) | 7.05 (6.58 – 7.54) | 7 (5, 9) |
150 – < 300 ppm | 278 | 1, 44 (43) | 7.19 (6.72 – 7.70) | 7 (5, 10) |
300 – < 1000 ppm | 1085 | 1, 30 (29) | 8.04 (7.81 – 8.28) | 8 (6, 11) |
1000 – < 2000 ppm | 537 | 2, 36 (34) | 9.37 (8.98 – 9.77) | 10 (7, 13) |
≥ 2000 ppm | 464 | 1, 38 (37) | 10.48 (9.95 – 11.03) | 11 (8, 15) |
Age Group | ||||
Less than 1 yr | 58 | 2, 34 (32) | 7.54 (6.50 – 8.75) | 7 (5, 10) |
1 yr | 154 | 1, 38 (37) | 9.98 (9.10 – 10.94) | 10 (8, 14) |
2 yrs | 175 | 2, 44 (42) | 10.81 (9.92 – 11.78) | 11 (7, 17) |
3 yrs | 177 | 2, 38 (36) | 10.11 (9.27 – 11.02) | 10 (7, 15) |
4 yrs | 208 | 1, 26 (25 | 8.79 (8.14 – 9.49) | 9 (6, 13) |
5 yrs | 297 | 1, 38 (37) | 8.98 (8.43 – 9.56) | 9 (6, 13) |
6 yrs | 301 | 2, 29 (27) | 8.43 (7.97 – 8.91) | 9 (6, 12) |
7 yrs | 283 | 2, 26 (24) | 8.38 (7.95 – 8.85) | 8 (6, 12) |
8 yrs | 291 | 1, 30 (29) | 7.88 (7.43 – 8.37) | 8 (6, 11) |
9 yrs | 269 | 1, 26 (25) | 7.57 (7.11 – 8.07) | 8 (5, 11) |
10 yrs | 237 | 1, 24 (23) | 7.06 (6.62 – 7.52) | 7 (5, 10) |
11 yrs | 225 | 1, 23 (22) | 6.77 (6.33 – 7.24) | 7 (5, 10) |
12 yrs | 91 | 2, 18 (16) | 6.72 (6.16 – 7.34) | 7 (5, 9) |
Total | 2766 | 1, 44 (43) | 8.31 (8.14 – 8.48) | 8 (6, 12) |