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Sensitivity, specificity, and predictive values for osteoporosis/osteopenia of HU measurements by spine QCT and DEXA.
| Variables | Cut-off Value | BMD | Sensitivity | Specificity | PPV* | NPV※ | |
|---|---|---|---|---|---|---|---|
| Abnormal | Normal | ||||||
| HU and QCT | ≤ 146 | 399 | 10 | 94.3% | 87.5% | 97.6% | 74.5% |
| > 146 | 24 | 70 | (399/423) | (70/80) | (399/409) | (70/94) | |
| HU and DEXA | ≤ 95 | 94 | 73 | 82.5% | 66.4% | 56.3% | 87.8% |
| > 95 | 20 | 144 | (94/114) | (144/217) | (94/167) | (144/164) |
*PPV = Positive predicted value
※NPV = Negative predicted value
