Table 1.
Baseline characteristics of subjects by treatment assignment and follow-up status
| Treatment assignment | Follow-up status | |||
|---|---|---|---|---|
| Calcium | Placebo | Included a | Not included | |
| (N = 334) | (N = 336) | (N = 563) | (N = 107) | |
| Variable | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) |
| Age (years) | 26.9 (5.6) | 25.9 (5.3)b | 26.5 (5.5) | 26.2 (5.3) |
| Education (years) | 10.8 (2.9) | 11.0 (3.2) | 10.9 (3.1) | 10.6 (2.9) |
| Number of pregnancies | 2.0 (1.0) | 2.1 (1.1) | 2.1 (1.0) | 2.0 (0.9) |
| Number of children | 0.8 (0.8) | 0.8 (0.9) | 0.8 (0.9) | 0.7 (0.7) |
| Number of months previous breastfeeding (cumulative lifetime) | 5.6 (8.9) | 6.8 (9.0) | 6.4 (9.2) | 5.1 (7.2) |
| BMI (kg/m2) | 25.9 (4.1) | 25.8 (3.7) | 25.9 (3.9) | 25.9 (3.9) |
| Energy intake (kcal/day) | 1888 (592) | 1862 (637) | 1860 (613) | 1951 (619) |
| Calcium intake (mg/day) | 1108 (492) | 1083 (532) | 1096 (515) | 1091 (497) |
| Hematocrit (%) | 39.1 (3.3) | 39.1 (3.0) | 39.1 (3.2) | 39.1 (2.7) |
| NTx (nM BCE/mM creatinine)c | 62.3 (1.7) | 62.9 (1.7) | 62.9 (1.7) | 52.2 (1.7) |
aDefined as having at least one visit completed after baseline and included in final model.
bp < 0.05 Wilcoxon rank-sum (Mann–Whitney U) two sample test of equality of distributions.
cGeometric mean and GSD; n = 291 treated, n = 285 with placebo.