Table 3. Sensitivity, specificity, and positive and negative predictive values of transcranial Doppler for detection of ICAS in comparison with magnetic resonance angiography in anterior circulation stenosis.

Parameter	Value
Abbreviations: ICAS, intracranial artery stenosis; NPV, negative predictive value; PPV, positive predictive value.
Sensitivity, %	85.9
Specificity, %	90.0
PPV, %	98.2
NPV, %	50.0