Table 2.
Specificity and sensitivity of HUD in predicting stone-free rate at 3 months and relative univariate analysis
| ROC curve | Stone free | Univariate analysis | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cut-off | AUC | Sens | Spec | p | no (%) | yes (%) | OR | (95%- CI) | p | |
| HUDST | <38.5 | 21 (55) | 17 (45) | 1.00 Ref | ||||||
| ≥38.5 | 0.66 | 70% | 63.8% | 0.016 | 9 (23) | 30 (77) | 4.12 | (1.54–10.99) | 0.005 | |
| HUDB | <49 | 21 (54) | 18 (46) | 1.00 Ref | ||||||
| ≥49 | 0.67 | 70% | 61% | 0.015 | 9 (24) | 29 (76) | 3.76 | (1.42–9.99) | 0.008 | |
Legend: HUD ratio between HU mean value and stone’s largest diameter at axial plane on soft tissue (ST) or bone (B) CT window, OR Odds ratio, CI Confidence interval