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