Table 2

Interobserver variability in measurement of degree of carotid stenosis on digital subtraction intra-arterial angiography, CT angiography, and MR angiography in symptomatic arteries

Digital subtraction intra-arterial angiography
Observer 1
OperableNot operableκ Value
Observer 2:Operable130
Not operable7140.60
MR angiography
Observer 3
OperableNot operableκ Value
Observer 4:Operable203
Not operable470.52
Spiral CT angiography
Observer 5
OperableNot operableκ Value
CT, computed tomography; MR, magnetic resonance.
Observer 6:Operable132
Not operable7120.48