Table 3.
Diagnostic performance of mean CT attenuation cutoff values in different ROI, expressed in Hounsfield unit (HU), for distinguishing normal from low bone mineral density and for distinguishing osteoporosis from nonosteoporosis
| Parameters | Osteoporosis | Exclusion of osteoporosis or osteopenia | ||||||
|---|---|---|---|---|---|---|---|---|
| Cutoff HU | Sensitivity (%) | Specificity (%) | Jorden Index | Cutoff HU | Sensitivity (%) | Specificity (%) | Jorden Index | |
| Round ROI | 87.75 | 79.5 | 81.5 | 0.61 | 118.13 | 84.8 | 73.1 | 0.58 |
| Oval ROI | 91.63 | 76.7 | 81.5 | 0.58 | 97.13 | 90.9 | 76.1 | 0.55 |
| Right ROI | 106.38 | 69.9 | 92.6 | 0.62 | 107.63 | 84.8 | 65.7 | 0.51 |
| Left ROI | 110.88 | 69.9 | 88.9 | 0.56 | 125.00 | 88.9 | 89.1 | 0.78 |
| Front ROI | 91.75 | 79.5 | 81.5 | 0.61 | 121.25 | 81.8 | 74.6 | 0.56 |