Sensitivity and specificity of observing sacroiliitis and enthesitis by color Doppler ultrasonography, with the Bath Ankylosing Spondylitis Disease Activity Index as a reference method. All values are percentages.
| Sensitivity | Specificity | Negative Predictive Value | Positive Predictive Value | Accuracy | |
|---|---|---|---|---|---|
| Sacroiliac joint | 92.0 | 68.8 | 87.4 | 78.6 | 85.1 |
| Entheses | 52.2 | 72.9 | 81.9 | 39.3 | 58.4 |