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TABLE 1: Interrater agreement and sensitivity and specificity in differentiating near occlusion from moderate stenosis using various criteria and combinations
Criteria Interrater Agreement Sensitivity (%) Specificity (%)
Delayed time of contrast arrival 0.46 37.5 93.8
Direct or indirect evidence of collaterals 0.71 75.0 93.8
ICA to ICA comparison of diameter reduction 0.75 75.0 90.6
ICA to ECA comparison of diameter reduction 0.83 84.4 93.8
One criterion present 0.76 90.6 84.4
Two or more criteria present 0.88 90.6 93.8
Three or more criteria present 0.72 59.4 96.9
Four criteria present 0.61 31.3 96.9
ICA to ICA or ICA to ECA comparison of diameter reduction 0.84 90.6 90.6
ICA to ICA and ICA to ECA comparison of diameter reduction 0.78 68.8 93.8
Note.—ICA indicates internal carotid artery; ECA, external carotid artery.

Criteria	Interrater Agreement	Sensitivity (%)	Specificity (%)
Delayed time of contrast arrival	0.46	37.5	93.8
Direct or indirect evidence of collaterals	0.71	75.0	93.8
ICA to ICA comparison of diameter reduction	0.75	75.0	90.6
ICA to ECA comparison of diameter reduction	0.83	84.4	93.8
One criterion present	0.76	90.6	84.4
Two or more criteria present	0.88	90.6	93.8
Three or more criteria present	0.72	59.4	96.9
Four criteria present	0.61	31.3	96.9
ICA to ICA or ICA to ECA comparison of diameter reduction	0.84	90.6	90.6
ICA to ICA and ICA to ECA comparison of diameter reduction	0.78	68.8	93.8