Skip to main content

Table 1 Baseline characteristics of subjects by treatment assignment and follow-up status

From: Effect of calcium supplementation on bone resorption in pregnancy and the early postpartum: a randomized controlled trial in Mexican Women

  Treatment assignment Follow-up status
  Calcium Placebo Includeda 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)
  1. aDefined as having at least one visit completed after baseline and included in final model.
  2. bp < 0.05 Wilcoxon rank-sum (Mann–Whitney U) two sample test of equality of distributions.
  3. cGeometric mean and GSD; n = 291 treated, n = 285 with placebo.
\