Table 1.

Interrater reliability and agreement in the full exercise (Round 1).

Variables	Mean Prevalence, %	Mean Agreement	Mean κ	Mean PABAK
US positive for GCA	61.1	0.88	0.76	0.77
Halo sign
Temporal arteries, all segments	31.3	0.77	0.47	0.55
Common superficial temporal artery	34.7	0.78	0.49	0.55
Frontal branch	31.2	0.77	0.46	0.54
Parietal branch	27.8	0.78	0.46	0.56
Axillary arteries	52.4	0.83	0.66	0.66
Compression sign
Temporal arteries, all segments	32.6	0.78	0.49	0.55
Common superficial temporal artery	35.4	0.78	0.51	0.57
Frontal branch	33.3	0.75	0.44	0.49
Parietal branch	29.2	0.80	0.53	0.60

PABAK: prevalence-adjusted bias-adjusted kappa; GCA: giant cell arteritis; US: ultrasound.