Table 1.
Summary of mother–infant lead levels in different matrices and transfer indices, Mexico City, 1997–1999.
| Lead matrix or transfer index | n | Mean ± SD | Minimum | Maximum |
|---|---|---|---|---|
| Maternal (1 month postpartum) | ||||
| Blood lead (μg/dL) | 81 | 7.7 ± 4.0 | 1.7 | 28.7 |
| Plasma lead (μg/L) | 81 | 0.1 ± 0.1 | 0.03 | 0.5 |
| Breast milk lead (μg/L) | 81 | 0.8 ± 0.7 | 0.04 | 3.2 |
| Plasma–blood lead ratio | 81 | 0.2 ± 0.1 | 0.06 | 0.42 |
| Breast milk–blood lead ratio | 81 | 1.2 ± 0.9 | 0.1 | 4.2 |
| Breast milk–plasma lead ratio | 81 | 7.7 ± 7.1 | 0.6 | 39.8 |
| Infant (3 months of age) | ||||
| Blood lead (μg/dL | 60 | 3.4 ± 2.2 | 0.5 | 14.5 |