Table 2.

Cohen’s kappa for interobserver agreement between sonographers and radiologists

Vessel	Sonographers	Radiologists
Lt axillary	0.94 (95% CI 0.83–1.00)	0.48 (95% CI − 0.12–1.00)
Lt carotid	0.68 (95% CI 0.42–0.94)	0.00 (95% CI 0.00–0.00)
Lt subclavian	1.00 (95% CI 1.00–1.00)	0.43 (95% CI − 0.03–0.90)
Lt temporal	0.94 (95% CI 0.83–1.00)	0.25 (95% CI − 0.03–0.53)
Lt frontal	0.65 (95% CI 0.40–0.90)	0.35 (95% CI 0.01–0.68)
Lt parietal	0.76 (95% CI 0.55–0.98)	0.31 (95% CI −0.03–0.65)
Lt vertebral	0.72 (95% CI 0.36–1.00)	Not calculated
Rt axillary	1.00 (95% CI 1.00–1.00)	− 0.05 (95% CI − 0.14–0.04)
Rt carotid	0.43 (95% CI 0.13–0.73)	0.65 (95% CI 0.02–1.00)
Rt subclavian	0.82 (95% CI 0.63–1.00)	0.20 (95% CI − 0.26–0.67)
Rt temporal	1.00 (95% CI 1.00–1.00)	0.44 (95% CI 0.14–0.75)
Rt frontal	0.77 (95% CI 0.52–1.00)	0.49 (95% CI 0.19–0.78)
Rt parietal	0.82 (95% CI 0.63–1.00)	0.29 (95% CI 0.02–0.57)
Rt vertebral	1.00 (95% CI 1.00–1.00)	Not calculated
Thoracic aorta	0.72 (95% CI 0.35–1.00)	0.00 (95% CI 0.00–0.00)
All vessels	0.84 (95% CI 0.79–0.89)	0.44 (95% CI 0.33–0.54)

NB. Statistics could not be calculated in the left and right vertebral arteries among the radiologists because data was too sparse