Table 4. Test performance of ultrasonic features for the diagnosis of PsA.
| Parameters | Joint synovial thickening | Joint PD signal grades | Joint bone erosion | Tendon sheath synovial thickening | Tendon sheaths PD signals | Entheses bone erosions | Entheses PD signals |
|---|---|---|---|---|---|---|---|
| Sensitivity | 67.52% | 22.08% | 23.99% | 78.45% | 45.69% | 15.36% | 16.48% |
| Specificity | 54.85% | 96.06% | 95.15% | 68.75% | 85.94% | 96.93% | 94.63% |
| Positive likelihood ratio | 1.50 | 5.60 | 4.95 | 2.51 | 3.25 | 5.00 | 3.07 |
| Negative likelihood ratio | 0.59 | 0.81 | 0.80 | 0.31 | 0.63 | 0.87 | 0.88 |
| Positive predictive value | 58.73% | 84.21% | 82.48% | 81.98% | 85.48% | 71.93% | 61.11% |
| Negative predictive value | 63.96% | 56.44% | 56.82% | 63.77% | 46.61% | 69.08% | 68.85% |