Table 1.
Blood lead (PbB) concentrations by selected sociodemographic characteristics of girls participating in the Breast Cancer Environment and Reproduction Program (final analytic sample, n=683).*
| PbB (ug/dL) | PbB<1 ug/dL (n=342) |
PbB≥1 ug/dL (n=341) |
|||||
|---|---|---|---|---|---|---|---|
| N (%) | GM | 95% CI | Mean (SD) |
Range | N (%) | N (%) | |
| Site | 683 | ||||||
| New York | 30 (4) | 1.17 | 0.98, 1.39 | 1.29 (0.63) | 0.44, 3.20 | 12 (4) | 18 (5) |
| Cincinnati | 326 (48) | 1.12 | 1.06, 1.18 | 1.28 (0.79) | 0.34, 5.40 | 153 (45) | 173 (51) |
| San Francisco Bay Area | 327 (48) | 0.93 | 0.89, 0.98 | 1.04 (0.51) | 0.18, 3.73 | 177 (52) | 150 (44) |
| Race/Ethnicity | 683 | ||||||
| Black | 192 (28) | 1.29 | 1.20, 1.37 | 1.45 (0.80) | 0.42, 5.40 | 60 (18) | 130 (39) |
| Hispanic | 103 (15) | 1.01 | 0.92, 1.11 | 1.13 (0.57) | 0.39, 3.65 | 48 (14) | 55 (16) |
| Asian | 42 (6) | 0.84 | 0.74, 0.95 | 0.91 (0.37) | 0.36, 2.19 | 26 (8) | 16 (5) |
| White | 346 (51) | 0.93 | 0.89, 0.98 | 1.05 (0.59) | 0.18, 5.30 | 208 (61) | 138 (40)** |
| Age at PbB Collection (years) | 683 | ||||||
| 6-< 7 | 121 (18) | 1.04 | 0.95, 1.14 | 1.19 (0.70) | 0.19, 4.40 | 62 (18) | 59 (17) |
| 7-< 8 | 283 (41) | 1.06 | 1.00, 1.12 | 1.19 (0.66) | 0.38, 5.40 | 132 (39) | 151 (44) |
| 8-< 9 | 207 (30) | 1.00 | 0.94, 1.07 | 1.15 (0.70) | 0.18, 5.30 | 110 (32) | 97 (28) |
| 9 - 10 | 72 (11) | 0.96 | 0.86, 1.06 | 1.06 (0.54) | 0.34, 3.20 | 38 (11) | 34 (10) |
| BMI Percentile | 683 | ||||||
| <50th | 254 (37) | 1.05 | 0.99, 1.12 | 1.20 (0.69) | 0.18, 4.30 | 117 (34) | 137 (40) |
| 50 - <85th | 230 (34) | 1.02 | 0.96, 1.08 | 1.15 (0.67) | 0.34, 5.30 | 120 (35) | 110 (32) |
| 85 - <95th | 104 (15) | 1.01 | 0.91, 1.12 | 1.17 (0.77) | 0.29, 5.40 | 54 (16) | 50 (15) |
| ≥95th | 95 (14) | 1.02 | 0.93, 1.10 | 1.11 (0.52) | 0.41, 2.80 | 51 (15) | 44 (13) |
| Height Percentile | 683 | ||||||
| <25th | 134 (20) | 1.02 | 0.94, 1.10 | 1.13 (0.61) | 0.43, 4.20 | 61 (18) | 73 (21) |
| 25th- <50th | 150 (22) | 1.09 | 1.01, 1.18 | 1.23 (0.69) | 0.19, 5.30 | 66 (19) | 84 (25) |
| 50th - <75th | 176 (26) | 1.03 | 0.96, 1.11 | 1.17 (0.64) | 0.18, 4.70 | 92 (27) | 84 (25) |
| ≥75th | 223 (33) | 0.99 | 0.93, 1.06 | 1.14 (0.71) | 0.29, 5.40 | 123 (36) | 100 (29) |
| Caregiver Education | 666 | ||||||
| High School or Less | 265 (40) | 1.09 | 1.03, 1.16 | 1.24 (0.70) | 0.29, 4.70 | 122 (36) | 143 (43) |
| College | 257 (39) | 1.00 | 0.94, 1.06 | 1.14 (0.67) | 0.18, 5.30 | 137 (41) | 120 (36) |
| Graduate School | 144 (22) | 0.95 | 0.89, 1.01 | 1.03 (0.49) | 0.34, 4.30 | 77 (23) | 67 (20) |
GM, geometric mean; 95%CI, 95% Confidence Interval; BMI, Body Mass Index
*
Sociodemographic characteristics of girls were assessed at the time of collection of PbB concentrations
**
chi-squared test, p<0.05