Performance of the ACR/EULAR criteria for identifying rheumatoid arthritis (RA) patients. ACR/EULAR values presented as median (interquartile range).
| Criteria | Value | AUC | (95% CI) | p* | Z statistic (p) |
|---|---|---|---|---|---|
| All patients, n = 30 | |||||
| ACR/EULAR | 5.0 (2.0) | 0.909 | (0.783–0.975) | 0.040 | 1.974 (0.048)# |
| US ACR/EULAR | 7.0 (2.0) | 0.948 | (0.836–0.992) | 0.028 | — |
| MRI ACR/EULAR | 7.0 (2.0) | 0.989 | (0.898–1.000) | 0.009 | 1.974 (0.048)# |
| US ≤ 10, n = 15 | |||||
| ACR/EULAR | 5.0 (1.0) | 0.898 | (0.746–0.975) | 0.052 | 2.181 (0.029)† |
| US ACR/EULAR | 5.0 (2.0) | 0.930 | (0.787–0.989) | 0.032 | — |
| MRI ACR/EULAR | 6.0 (1.0) | 0.986 | (0.872–1.000) | 0.014 | 2.181 (0.029)† |
| US > 10, n = 15 | |||||
| ACR/EULAR | 5.0 (1.0) | 0.940 | (0.802–0.993) | 0.047 | — |
| US ACR/EULAR | 7.0 (1.0) | 1.000 | (0.897–1.000) | 0.000 | — |
| MRI ACR/EULAR | 7.0 (1.0) | 1.000 | (0.897–1.000) | 0.000 | — |
↵* Receiver-operating characteristic curve (ROC) analysis. Z statistic results from pairwise comparison of ROC curves (ACR/EULAR versus US ACR/EULAR versus MRI ACR/EULAR).
↵†: Pairwise comparison with statistically significant association.
↵# Represents a tendency. ACR/EULAR: performance of ACR/EULAR score for identifying RA patients; US ACR/EULAR: performance of ACR/EULAR score for identifying RA patients, with correction of the clinical joint counts by the US joint and tendon counts; MRI ACR/EULAR: performance of ACR/EULAR score for identifying RA patients, with correction of the clinical joint counts by the MRI joint and tendon counts; US ≤ 10: patients with US joint and tendon counts ≤ 10; US > 10: patients with US joint and tendon counts > 10; AUC: area under the ROC; MRI: magnetic resonance imaging; US: ultrasound.