Table 2.
Sample size and distribution of blood lead concentrations in pregnancy, delivery and in umbilical cord blood
| n (%) | Mean ± SD | 10pct | 25pct | 50pct | 75pct | 90pct | Range (μg/dL) | |
|---|---|---|---|---|---|---|---|---|
| Maternal blood lead | ||||||||
| 2nd trimester (μg/dL) | 410 | 3.79 ± 2.63 | 1.44 | 2.07 | 2.91 | 4.51 | 7.13 | 0.75, 17.81 |
| 3rd trimester (μg/dL) | 356 | 3.90 ± 2.84 | 1.45 | 2.11 | 3.10 | 4.73 | 7.21 | 0.77, 28.25 |
| At delivery (μg/dL) | 354 | 4.16 ± 2.85* | 1.61 | 2.28 | 3.35 | 5.28 | 7.64 | 0.77, 21.40 |
| Cord blood lead | ||||||||
| At delivery (μg/dL) | 346 | 3.50 ± 2.59 | 1.22 | 1.77 | 2.83 | 4.45 | 6.57 | 0.40, 18.56 |
*
Significant differences p<0.01, blood levels at 2nd trimester as a reference, P-value was obtained from ANOVA test.