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| Variable | Cut-off | ACU | Sensitivity (%) | Specificity (%) | p |
|---|---|---|---|---|---|
| Blood flow velocity 90º+ (cm/s) | ≤8.24 | 0.77 | 63.2 | 88.1 | <0.001 |
| Anesthesia duration (min) | >195 | 0.75 | 68.4 | 85.7 | <0.001 |
| Position duration (min) | >80 | 0.72 | 68.4 | 79.8 | 0.005 |
| Diameter of vein 90º+ (mm) | >10.88 | 0.52 | 42.1 | 71.4 | 0.764 |
ROC = receiver operating characteristic curve; DVT = deep vein thrombosis; ACU = area under the curve; ACU 1 value represents perfect test and area of 0.5 worthless test
