Table 3.
Distributions of sex-specific MDCT-derived trabecular and cortical bone measures.
| Bone measures (units) | Mean (SD) | Min | 5th pctl | 10th pctl | 25th pctl | Median | 75th pctl | 90th pctl | 95th pctl | Max |
|---|---|---|---|---|---|---|---|---|---|---|
| Females (N=178) | ||||||||||
| Trabecular (Tb) | ||||||||||
| Tb.vBMD (mg/cc) | 1164.4 (32.1) | 1086.9 | 1113.2 | 1125.3 | 1144.6 | 1160.9 | 1185.8 | 1203.0 | 1213.1 | 1333.1 |
| Tb.tBMD (mg/cc) | 312.1 (86.3) | 102.5 | 192.2 | 212.9 | 255.9 | 297.2 | 362.3 | 418.2 | 450.8 | 759.6 |
| Tb.pBMD (mg/cc) | 928.2 (120.9) | 497.9 | 727.6 | 774.3 | 862.9 | 920.0 | 1016.5 | 1075.0 | 1107.8 | 1284.4 |
| Tb.NA (cm2/cm3) | 0.05(0.01) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 |
| Tb.PW (μm) | 1211.0 (315.9) | 658.2 | 836.9 | 888.3 | 997.3 | 1146.9 | 1375.4 | 1534.7 | 1762.1 | 3108.7 |
| Tb.Th (μm) | 161.6 (23.8) | 116.0 | 134.8 | 139.9 | 149.1 | 158.8 | 169.9 | 181.5 | 188.2 | 337.8 |
| Tb.Sp (μm) | 439.6 (85.1) | 252.2 | 314.6 | 342.8 | 375.4 | 440.0 | 484.0 | 546.4 | 594.5 | 835.5 |
| Cortical (Cb) | ||||||||||
| Cb.Poro (no unit) | 0.21 (0.02) | 0.18 | 0.20 | 0.20 | 0.20 | 0.21 | 0.22 | 0.23 | 0.24 | 0.43 |
| Cb.Th (μm) | 2.01 (0.23) | 1.45 | 1.67 | 1.73 | 1.84 | 1.97 | 2.17 | 2.33 | 2.42 | 2.63 |
| Males (N=146) | ||||||||||
| Trabecular (Tb) | ||||||||||
| Tb.vBMD (mg/cc) | 1182.9 (27.7)** | 1125.5 | 1137.5 | 1148.2 | 1165.0 | 1180.7 | 1203.8 | 1217.6 | 1225.4 | 1256.7 |
| Tb.tBMD (mg/cc) | 360.4 (74.2)** | 187.4 | 252.0 | 268.3 | 309.5 | 350.2 | 410.8 | 466.6 | 479.9 | 600.1 |
| Tb.pBMD (mg/cc) | 1005.0 (103.1)** | 616.4 | 819.9 | 867.3 | 941.7 | 1013.8 | 1079.0 | 1125.0 | 1148.8 | 1211.9 |
| Tb.NA (cm2/cm3) | 0.06 (0.01)** | 0.03 | 0.04 | 0.05 | 0.05 | 0.06 | 0.07 | 0.08 | 0.08 | 0.11 |
| Tb.PW (μm) | 1375.7 (300.2)** | 775.6 | 944.5 | 1028.4 | 1175.7 | 1337.7 | 1554.4 | 1782.6 | 1868.6 | 2595.8 |
| Tb.Th (μm) | 173.2 (24.9)** | 128.6 | 143.2 | 149.8 | 159.3 | 171.1 | 183.0 | 195.9 | 201.0 | 387.4 |
| Tb.Sp (μm) | 398.0 (63.9)** | 281.9 | 304.3 | 318.0 | 348.5 | 397.1 | 432.0 | 474.1 | 529.7 | 569.9 |
| Cortical (Cb) | ||||||||||
| Cb.Poro (no unit) | 0.23 (0.02)** | 0.19 | 0.21 | 0.21 | 0.22 | 0.23 | 0.23 | 0.24 | 0.24 | 0.47 |
| Cb.Th (μm) | 2.32 (0.27)** | 1.71 | 1.89 | 1.99 | 2.13 | 2.30 | 2.54 | 2.64 | 2.77 | 3.09 |
**
p-value < 0.01 for comparisons between sexes using t-tests.
Tb.vBMD: volumetric BMD, Tb.tBMD: transpose BMD, Tb.pBMD: plate trabecula BMD, Tb.NA: trabecular network, Tb.PW: plate width, Tb.Th: trabecular thickness, Tb.Sp: trabecular spacing, Cb.Poro: cortical porosity, Cb.Th: cortical thickness pctl = percentile