Table 1.
Short-term reproducibility parameters: mean and standard deviation of baseline measures, root mean square of standard deviation (RMSSD), and root mean square of percent coefficient of variance (RMS%CV) of trabecular bone density, microstructure, and stiffness measurements based on registered and unregistered scans.
| BV/TV | Tb.N* (1/mm) | Tb.Th* (mm) | Tb.Sp* (mm) | SMI | Conn.D (1/mm3) | Tb.BMD (mgHg/cm3) | Tb.TMD (mgHg/cm3) | Stiffness (kN/mm) | |
|---|---|---|---|---|---|---|---|---|---|
| Baseline scan measurements | |||||||||
| Mean ±SD | 0.300 ±0.077 | 5.33 ±0.51 | 0.0754 ±0.0093 | 0.167 ±0.020 | 1.30±0.69 | 141±28 | 393±63 | 923±15 | 82±30 |
| Unregistered baseline and follow-up scans | |||||||||
| RMSSD | 0.00718 | 0.141 | 0.000897 | 0.00297 | 0.144 | 10.255 | 4.462 | 7.850 | 7.853 |
| RMS%CV | 2.65% | 2.49% | 1.20% | 1.76% | 4.29% | 7.49% | 1.14% | 0.85% | 8.83% |
| Registered baseline and follow-up scans | |||||||||
| RMSSD | 0.00609 | 0.113 | 0.000687 | 0.00225 | 0.129 | 9.304 | 3.848 | 6.901 | 6.109 |
| RMS%CV | 2.37% | 2.01% a | 0.97% | 1.33% | 4.01% | 7.01% | 1.01% | 0.75% a | 6.48% b |
Significant improvement from the unregistered comparison was indicated by
a
p<0.05;
b
p<0.005