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Table 1 Basic characteristics and bone mineral density (BMD) in the cohort of postmenopausal women, grouped according to number of children borne.

From: Effects of multiparity and prolonged breast-feeding on maternal bone mineral density: a community-based cross-sectional study

  All women
(n = 210)
Number of children borne
   None (n = 35) 1–2 (n = 38) 3–4 (n = 70) ≥ 5 (n = 67) p value
Age (years) 64.6 (63.4–65.8) 62.4 (59.9–64.8) 64.4 (61.4–67.4) 62.5 (60.5–64.6) 68.1 (66.1–70.1) < 0.001
Age of menopause 47.8 (47.2–48.4) 47.1 (45.6–48.6) 48.0 (46.7–49.3) 48.0 (47.0–49.0) 47.7 (46.7–48.8) 0.79
Duration since menopause 16.6 (15.3–17.9) 14.4 (11.0–17.7) 16.4 (13.4–19.3) 14.4 (12.2–16.6) 20.1 (17.8–22.4) < 0.01
Height (m) 1.47 (1.46–1.48) 1.48 (1.46–1.50) 1.47 (1.45–1.49) 1.47 (1.46–1.49) 1.46 (1.45–1.47) 0.47
Weight (kg) 45.6 (44.3–46.9) 43.4 (39.8–46.9) 45.8 (43.1–48.5) 46.7 (44.3–49.1) 45.6 (43.4–47.8) 0.41
Body mass index (BMI; kg/m2) 21.2 (20.6–21.7) 19.8 (18.3–21.4) 21.2 (20.1–22.3) 21.6 (20.5–22.6) 21.4 (20.4–22.4) 0.216
Total duration of breast-feeding (months) 61.3 (54.5–68.2) - 28.6 (23.3–33.8) 59.2 (53.2–65.1) 114.6 (104.0–124.5) < 0.001
Children (n) 3.5 (3.2–3.9) 0 1.6 (1.4–1.8) 3.5 (3.4–3.7) 6.4 (6.2–6.7) -
L2–L4 vertebrae BMD (g/cm2) 0.688 (0.668–0.707) 0.673
(0.630–0.716)
0.693
(0.650–0.737)
0.698
(0.667–0.729)
0.681
(0.649–0.714)
0.77
Femoral neck BMD (g/cm2) 0.628 (0.612–0.644) 0.613
(0.580–0.646)
0.648
(0.616–0.680)
0.637
(0.614–0.661)
0.614
(0.589–0.639)
0.24
  1. Data are given as mean (95% confidence intervals) of each group with a p-value for the general trend.
  2. BMD data presented are adjusted for age.