CDUS diagnostic properties for the diagnosis of sacroiliitis at patient level.
| Properties | All Patients, n = 99 (198 SIJ) | Suspected SpA Patients, n = 63 (126 SIJ) | SpA Patients, n = 36 (72 SIJ) |
|---|---|---|---|
| Sensitivity, % (95% CI) | 63 (49–76) | 64 (45–80) | 62 (38–82) |
| Specificity, % (95% CI) | 89 (76–96) | 93 (78– 99) | 80 (52–96) |
| PPV, % (95% CI) | 87 (73–96) | 91 (72–99) | 81 (54–96) |
| NPV, % (95% CI) | 67 (53–78) | 70 (53.5–83) | 60 (36–81) |
| LR+ (95% CI) | 5.7 (2.4–13.3) | 9.55 (2.4–37) | 3.1 (1.1–9) |
| LR− (95% CI) | 0.42 (0.29–0.6) | 0.39 (0.25–0.62) | 0.48 (0.26–0.87) |
CDUS: color Doppler ultrasound; SIJ: sacroiliac joints; SpA: spondyloarthritis; LR+: likelihood ratio positive; LR−: LR negative; PPV: positive predictive value; NPV: negative predictive value.