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Table 2: Sensitivity, specificity (95% confidence limits in parentheses), positive predictive value, negative predictive value, and accuracy of MSCTA in the characterization of intracranial vasospasms at the level of the distal internal carotid artery and the intracranial cerebral arteries
Vasospasm Grade True-Positive False-Positive False-Negative True-Negative Sensitivity (%) Specificity (%) Accuracy (%) Positive Predictive Value (%) Negative Predictive Value (%)
Mild-Moderate 
    Distal ICA 3 0 6 34 33.3 (64–3) 100 86 100 85
    Intracranial cerebral arteries 33 6 5 183 86.8 (76–98) 96.8 (94–99) 95.2 84.6 97.3
Severe 
    Distal ICA 2 0 0 34 100 100 100 100 100
    Intracranial cerebral arteries 13 1 4 183 76.5 (57–96) 99.5 (98–100) 97.5 92.9 97.9
Note:—MSCTA indicates multisection CT angiography; ICA, internal carotid artery.