Table 6.
Results of validation study
|
Area
|
vBMD
|
Cortical
|
|||||
|---|---|---|---|---|---|---|---|
| Cortical | Trabecular | Integral | Cortical | Trabecular | Integral | thickness | |
| Mean (95% CI) values from μCT | |||||||
| IA | 42 (38, 46) | 192 (174, 210) | 234 (218, 249) | .64 (.60, .68) | .23 (.22, .25) | .32 (.31, .32) | 1.7 (1.6, 1.9) |
| SA | 21 (19, 22) | 212 (205, 219) | 233 (226, 240) | .59 (.56, .62) | .21 (.20, .21) | .24 (.24, .25) | 0.9 (0.9, 1.0) |
| SP | 24 (22, 26) | 213 (197, 229) | 237 (221, 253) | .61 (.58, .64) | .21 (.20, .22) | .25 (.24, .26) | 1.0 (1.0, 1.1) |
| IP | 41 (36, 46) | 193 (183, 203) | 234 (226, 242) | .64 (.61, .67) | .23 (.22, .24) | .30 (.30, .31) | 1.7 (1.5, 1.9) |
| Total | 127 (117, 139) | 834 (784, 884) | 962 (917, 1008) | .63 (.59, .66) | .22 (.21, .23) | .28 (.28, .29) | 1.0 (1.3, 1.5) |
| Mean (95% CI) percentage differences (100(QCT-μCT)/μCT) | |||||||
| IA | −6 (−13, 0) | 2 (1, 3) | −1 (−1, 0) | −17 (−20, −13) | 7 (5, 9) | −4 (−4, −4) | 6 (0, 12) |
| SA | 22 (15, 28) | −3 (−3, −2) | −1 (−1, −1) | −37 (−39, −35) | 2 (2, 3) | −5 (−6, −5) | 1 (4, 7) |
| SP | 18 (8, 29) | −2 (−3, −2) | −1 (−1, −1) | −33 (−35, −30) | 3 (2, 4) | −5 (−5, −5) | 6 (0, 13) |
| IP | −1 (−8, 6) | 1 (0, 2) | −1 (−1, 0) | −18 (−21, −14) | 6 (4, 8) | −4 (−4, −3) | 10 (5, 14) |
| Total | 4 (−3, 11) | 2 (1, 2) | 1 (1, 2) | −24 (−26, −22) | 5 (4, 6) | −3 (−3, −3) | 6 (2, 11) |
Units of mean value from μCT: Area in mm2, vBMD in g/cm3 and cortical thickness in mm.
IA: Infero-anterior; SA: Supero-anterior; SP: Supero-posterior; IP: Infero-posterior;