Variables | Total N | Agreement analogy* N | Interobserver agreement* (%) | Interobserver reliability*, kappa coefficient | 95% confidence limits |
---|---|---|---|---|---|
Primary outcome | |||||
US positive for GCA | 112 | No-No=43 Yes-Yes=65 | 96% | 0.92 | 0.85–0.99 |
Key secondary outcomes | |||||
US positive for cGCA | 112 | No-No=49 Yes-Yes=57 | 95% | 0.89 | 0.81–0.98 |
US positive for LV-GCA | 112 | No-No=88 Yes-Yes =20 | 96% | 0.89 | 0.78–0.99 |
Other secondary outcomes | |||||
Halo sign temporal arteries, all segments | 112 | No-No=52 Yes-Yes=55 | 96% | 0.91 | 0.83–0.99 |
Compression sign temporal arteries, all segments | 107 | No-No=52 Yes-Yes=49 | 94% | 0.89 | 0.80–0.98 |
Halo sign facial arteries, all segments | 112 | No-No=86 Yes-Yes=21 | 96% | 0.87 | 0.75–0.98 |
Compression sign facial arteries, all segments | 107 | No-No=88 Yes-Yes=15 | 96% | 0.86 | 0.73–0.99 |
Hallo sign axillary arteries | 112 | No-No=90 Yes-Yes=19 | 97% | 0.91 | 0.81–1.00 |
Hallo sign common carotid artery | 112 | No-No=106 Yes-Yes=6 | 100% | 1.00 | 1.00–1.00 |
*Between the US expert and the ultrasonographer.
cGCA, cranial GCA; GCA, giant cell arteritis; LV-GCA, large vessel GCA; US, ultrasound.