Table 4.
Hg concentrations and P value in 50 pairs of maternal and cord plasma and RBCs.
| Birth outcome | Geometric mean (95% CI) (μg/l) |
|||
|---|---|---|---|---|
| Mother plasma | Cord plasma | Mother RBCs | Cord RBCs | |
| Gestational age | ||||
| < 37 weeks | 0.93 (0.78–1.10) | 0.83 (0.73–0.94) | 1.86 (1.49–2.33) | 2.22 (1.67–2.96) |
| ≥ 37 weeks | 0.55 (0.48–0.63) | 0.46 (0.40–0.53) | 1.37 (1.21–1.55) | 1.65 (1.46–1.86) |
| P for trenda | 0.0002 | 0.0024 | 0.026 | 0.039 |
| Birthweight | ||||
| <2500 g | 0.91 (0.77–1.08) | 0.79 (0.69–0.90) | 1.86 (1.51–2.30) | 2.24 (1.71–2.94) |
| ≥2500 g | 0.55 (0.48–0.63) | 0.46 (0.40–0.53) | 1.37 (1.21–1.55) | 1.65 (1.46–1.86) |
| P for trend | 0.0078 | 0.055 | 0.16 | 0.19 |
a
P for trend was tested using linear regression model: Y=Hg, X=gestational age or birthweight.