Cut-off values for slope sign (axillary to brachial IMT ratio) and increased IMT in the axillary artery (GCA patients vs controls)
| Area under the curve | Optimal cut-off | Sensitivity (%) | Specificity (%) | |
| Slope sign (axillary to brachial IMT ratio) | 0.883 | 2.05 | 87.0 | 88.9 |
| Increased IMT (axillary artery) | 0.969 | 0.81 mm | 87.0 | 93.7 |
Maximal IMT value from bilateral ultrasound measurements was chosen. Minimal difference between sensitivity and 1–specificity was chosen for optimal IMT cut-off values for vasculitis.
GCA, giant cell arteritis; IMT, intima-media thickness.