Table 1.
Maternal blood lead (Pb) concentrations during 2nd trimester of 200 Mexican schoolgirls, according to sociodemographic characteristics
| Maternal sociodemographic characteristics | N | Median Pb concentration at 2nd trimester, μg/dL (IQR) | Proportion with Pb concentration at 2nd trimester ≥ 5 μg/dL, % |
|---|---|---|---|
| Maternal age at 2nd trimester lead assessment, y | |||
| <25 | 64 | 3.9 (2.2, 6.5) | 34.4 |
| 25 to <30 | 72 | 4.0 (2.3, 5.8) | 34.7 |
| 30 to <35 | 35 | 4.2 (2.8, 7.5) | 34.3 |
| ≥35 | 29 | 4.3 (2.8, 7.3) | 44.8 |
| P, trend | 0.45 | 0.43 | |
| Maternal parity, number of previous pregnancies | |||
| 0 or 1 | 77 | 4.0 (2.2, 5.7) | 31.2 |
| 2 | 67 | 4.5 (2.8, 6.4) | 44.8 |
| ≥3 | 56 | 3.9 (2.6, 6.7) | 32.1 |
| P, trend | 0.52 | 0.78 | |
| Maternal education, y | |||
| Did not complete secondary (<9) | 29 | 4.8 (3.8, 7.9) | 48.3 |
| Completed some high school (9 to <12) | 78 | 3.9 (2.3, 5.7) | 34.6 |
| Completed high school (12) | 65 | 4.5 (2.6, 6.2) | 36.9 |
| Higher education (>12) | 28 | 3.5 (1.9, 5.0) | 25.0 |
| P, trend | 0.16 | 0.14 | |