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Table 5: 
Diagnosis-based validation of eTCCD subgroups in correlation to DSA after consensus review
FindingsAbnormalities
Normal (n = 24)Abnormal (n = 140)Extracranial (n = 98)Intracranial (n = 32)VB (n = 21)
N.E.4 (0–21)4 (1–8)6 (2–13)0 (0–11)0 (0–16)
SensitivityN/A82 (74–89)83 (71–92)81 (64–93)76 (53–92)
Specificity100 (85–100)97 (84–100)97 (84–100)N/AN/A
PPVN/A99 (94–100)98 (89–100)100 (87–100)100 (79–100)
NPV100 (85–100)64 (49–77)76 (61–88)0 (0–46)0 (0–52)
  • Note:—VB indicates vertebrobasilar; NE, not evaluable; PPV, positive predictive value; NPV, negative predictive value; N/A, not available; eTCCD, echo-enhanced transcranial color-coded duplex sonography; DSA, digital subtraction angiography. All values are shown in percent. Numbers in parentheses represent 95% confidence intervals.