Table 4.
Reproducibility of bone variables at the 20% diaphyseal radius (mean ± SEM)
| Variable | Premenopausal subjects (n = 7) | Postmenopausal subjects (n = 8) | All subjects (n = 15) | rmsCV (%)(n = 15) |
|---|---|---|---|---|
| Density (mg/cm3) | ||||
| TOT_DEN | 890 ± 24.5 | 916 ± 34.9 | 899 ± 22.6 | 3.3 |
| CRT_DEN | 1253 ± 6.8 | 1266 ± 10.4 | 1259 ± 6.7 | 0.5 |
| Mass (mg) | ||||
| TOT_CNT | 97 ± 4.2 | 94 ± 2.3 | 95 ± 2.3 | 1.4 |
| CRT_CNT | 91 ± 4.1 | 88 ± 2.3 | 89 ± 2.2 | 0.6 |
| Area (mm2) | ||||
| TOT_A | 110 ± 6.1 | 103 ± 4.4 | 107 ± 3.8 | 3.8 |
| CRT_A | 73 ± 3.5 | 70 ± 1.7 | 71 ± 1.8 | 0.9 |
| Geometry | ||||
| CRT_THK (mm) | 2.5 ± 0.1 | 2.5 ± 0.1 | 2.5 ± 0.7 | 3.1 |
| PERI_CIR (mm) | 37 ± 1.0 | 36 ± 0.8 | 37 ± 0.7 | 5.5 |
| ENDO_CIR (mm) | 22 ± 1.0 | 20 ± 1.3 | 21 ± 0.9 | 1.9 |
| PMI (mm3) | 1698 ± 189 | 1494 ± 91 | 1593 ± 101 | 2.1 |
| PMR (mm3) | 229 ± 16 | 198 ± 7 | 213 ± 9 | 2.0 |
| SSI (mm3) | 138 ± 16 | 208 ± 7 | 222 ± 9 | 1.7 |
CRT_A = cortical area; CRT_CNT = cortical content; CRT_DEN = cortical density; CRT_THK = cortical thickness; ENDO_CIR = endosteal circumference; PERI_CIR = periosteal circumference; PMI = polar moment of inertia; PMR = polar moment of resistance; rmsCV = root mean square coefficient of variation; SEM = standard error of the mean; SSI = stress-strain index; TOT_A = total area; TOT_CNT = total content; TOT_DEN = total density.