Table 4.
Difference in concentrations between enrollment (1st or 2nd trimester) and delivery compared with laboratory method variability (3.0 times quality control standard deviation). All concentrations in μg/L.
| Metal | N | Median Change, (delivery – enrollment)† | Quality control Mean (3.0*SD) |
|---|---|---|---|
| Cd | 195 | −0.060 | 0.217 (0.049) |
| Hg | 193 | 0.000 | 0.329 (0.210) |
| Mn | 195 | 0.000 | 0.805 (0.225) |
| Pb | 196 | −0.050 | 0.441 (0.053) |
| As (total) | 192 | −0.600 | 10.12 (0.570) |
| Tl | 196 | −0.025 | 0.173 (0.025) |
| U | 195 | −0.0021 | 0.0174 (0.0034) |
Note.
†
pairwise difference