Table 3.
Timeline of B-Pb, Hb and ZZP in the group of lead exposed children during 60 months of follow-up.
| Time (months) | ||||
|---|---|---|---|---|
| Variable | 0 | 6 | 12 | 60 |
| B-Pb concentration (μg/dl) Median (range) | 10.12 (1.9-43.8) |
8.75 (1.85-41.45) |
8.3 (2.4-35.8) |
4.4 (1.3 - 30.3) |
| B-Pb ≥ 10 μg/dl (%) | 50.84 | 39.46 | 37.42 | 5.6 |
| Hemoglobin (g/dl)b | 13.4 (10.0-16.5) |
13.6 (10.2-16.6) |
13.5 (11.2 - 15.9) |
13.9 (10.7-15.9) |
| ZPP b (μmol ZP/mole Heme) | 63.0 (10.0-224.0) |
62.0 (25-197) |
57 (34-180) |
65 (16-248) |
| Hb < 12.4 g/dl (%) | 10.02 | 7.32 | 7.23 | 4.32 |
| Hb < 12.4 g/dl Risk ratio (95% IC)ŧ | 2.41* (1.26 - 4.63) |
1.76 (0.89 - 3.48) |
1.74 (0.87 - 3.46) |
1.0 |
| ZPP ≥ 66 (μmol ZP/mole Heme) (%) | 40.64 | 43.44 | 30.02 | 44.26 |
ŧ As the last time (60 months) had the lower lead concentration in blood, this point was taken as the basal level of exposure.
b Values are medians (range).
*. p < 0.05 two sided Fisher's exact test.