Table 1.
Baseline characteristics of participants, by treatment assignment and follow-up status.
| Treatment assignment
|
Follow-up status
|
|||
|---|---|---|---|---|
| Variable | Calcium (n = 334) | Placebo (n = 336) | Completeda (n = 565) | Lost (n = 105) |
| Age (years) | 26.9 ± 5.6 | 25.9 ± 5.3b | 26.5 ± 5.5 | 26.2 ± 5.4 |
| Education (years) | 10.8 ± 2.9 | 10.6 ± 2.9 | 10.7 ± 2.9 | 10.7 ± 2.8 |
| No. of pregnancies | 2.0 ± 1.0 | 2.1 ± 1.1 | 2.1 ± 1.1 | 2.0 ± 0.9 |
| Weight (kg) | 61.9 ± 10.7 | 61.5 ± 10.0 | 61.6 ± 10.2 | 62.2 ± 11.0 |
| Height (cm) | 154.4 ± 5.6 | 154.4 ± 5.9 | 154.3 ± 5.8 | 155.0 ± 5.8 |
| Dietary calcium intake (g/day) | 0.92 ± 0.35 | 0.89 ± 0.40 | 0.90 ± 0.38 | 0.94 ± 0.34 |
| Total energy intake (kcal/day) | 2,213 ± 632 | 2,157 ± 675 | 2,155 ± 642 | 2,347 ± 699b |
| Current use of LGC [no. (%)] | 117 (35%) | 115 (34%) | 205 (36%) | 27 (26%)b |
| Blood lead (μg/dL)c | 3.8 (2.0) | 4.1 (2.0) | 3.8 (2.0) | 4.5 (1.9) |
Values are mean ± SD except where noted.
a
Completed follow-up defined as having at least one follow-up blood lead level at 6 or 8 months of pregnancy.
b
p < 0.05 Student’s t-test or Wilcoxon rank-sum (Mann–Whitney U-test) two-sample test of equality for difference in means or chi-square test, as appropriate.
c
Geometric mean (geometric standard deviation) blood lead levels.