Table 3. Differences in BMD of the femur neck and lumbar spine (subgroup analysis according to serum vitamin D levels).
| 25(OH)D <20 ng/mL | 25(OH)D ≥20 ng/mL | |||||||
|---|---|---|---|---|---|---|---|---|
| Caa) <400 mg | 400 mg ≤ Caa) <800 mg | Caa) ≥800 mg | P-value | Caa) <400 mg | 400 mg ≤ Caa) <800 mg | Caa) ≥800 mg | P-value | |
| Femur neck BMD | 0.610 (0.100) | 0.626 (0.107) | 0.624 (0.967) | 0.508b) | 0.654 (0.099) | 0.655 (0.095) | 0.658 (0.102) | 0.311b) |
| Normal | 129 (19.3) | 93 (22.8) | 21 (21.6) | 0.907c) | 117 (27.8) | 75 (31.5) | 28 (31.8) | 0.673§ |
| Osteopenia | 380 (56.8) | 241 (59.1) | 59 (60.8) | 256 (60.8) | 141 (59.2) | 52 (59.1) | ||
| Osteoporosis | 160 (23.9) | 74 (18.1) | 17 (17.6) | 48 (11.4) | 22 (9.3) | 8 (9.1) | ||
| Lumbar BMD | 0.765 (0.115) | 0.790 (0.132) | 0.798 (0.126) | 0.624b) | 0.822 (0.117) | 0.824 (0.132) | 0.830 (0.132) | 0.087b) |
| Normal | 91 (13.6) | 98 (24.0) | 21 (21.6) | 0.907c) | 125 (29.7) | 44 (18.5) | 27 (30.7) | 0.015c) |
| Osteopenia | 341 (51.0) | 163 (40.0) | 50 (51.6) | 198 (47.0) | 124 (52.1) | 44 (50.0) | ||
| Osteoporosis | 237 (35.4) | 147 (36.0) | 26 (26.8) | 98 (23.3) | 70 (29.4) | 17 (19.3) | ||
Age and body weight were adjusted.
BMD, bone mineral density; 25(OH)D, 25-hydroxyvitamin D; Ca, calcium.
a)Daily calcium intake; b)Analysis of covariance; c)Chi-square test.