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Table 2 Basic characteristics and bone mineral density (BMD) in women, grouped according to total duration of breast-feeding.

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

  Duration of breast-feeding (months)
  Never (n = 36) 1–48 months (n = 68) 49–96 months (n = 61) ≥ 97 months (n = 45) p value
Age (years) 62.6 (59.9–65.3) 62.8 (60.8–64.8) 64.3 (62.2–66.4) 69.4 (67.0–71.8) < 0.001
Height (m) 1.48 (1.46–1.50) 1.47 (1.46–1.49) 1.46 (1.45–1.48) 1.46 (1.44–1.48) 0.48
Age of menopause (years) 47.2 (45.8–48.7) 47.6 (46.6–48.6) 48.3 (47.2–49.3) 47.8 (46.6–49.1) 0.69
Duration since menopause (years) 14.6 (11.3–17.8) 15.1 (12.9–17.3) 15.5 (13.2–17.9) 21.7 (19.0–24.5) < 0.001
Weight (kg) 43.4 (40.3–46.5) 46.1 (43.9–48.4) 46.8 (44.5–49.2) 45.0 (42.3–47.8) 0.33
Body mass index (BMI; kg/m2) 19.8 (18.3–21.2) 21.3 (20.3–22.3) 21.8 (20.8–22.8) 21.1 (19.1–22.4) 0.16
Total period of breast-feeding (months) - 31.5 (27.1–35.9) 75.6 (71–80.2) 136.2 (130.8–141.5) -
Children (n) 0 2.5 (2.2–2.8) 4.3 (4.0–4.6) 6.8 (6.4–7.2) < 0.001
L2–L4 vertebrae BMD (g/cm2) 0.670 (0.628–0.711) 0.694 (0.661–0.726) 0.709 (0.676–0.742) 0.666 (0.627–0.705) 0.31
Femoral neck BMD (g/cm2) 0.613 (0.580–0.646) 0.643 (0.620–0.668) 0.637 (0.611–0.662) 0.603 (0.573–0.634) 0.15
  1. Data are given as mean (95% confidence interval) of each group with a p-value for the general trend.
  2. BMD data presented are adjusted for age.