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Table 4: 
Diagnostic performance of CTA according to aneurysm location in subgroups*
LocationSensitivitySpecificityPPVNPV
Anterior cerebral artery0.97 (35/36)1.00 (81/81)1.00 (35/35)0.99 (81/82)
    95% CI0.81–0.990.95–1.000.88–1.000.93–1.00
ICA0.81 (25/31)0.97 (83/86)0.89 (25/28)0.93 (83/89)
    95% CI0.63–0.910.90–0.990.72–0.970.86–0,97
MCA0.90 (28/31)1.00 (86/86)1.00 (28/28)0.97 (86/89)
    95% CI0.74–0.970.95–1.000.86–1.000.90–0.99
Posterior circulation0.95 (18/19)1.00 (98/98)1.00 (18/18)0.99 (98/99)
    95% CI0.74–1.000.95–1.000.79–1.000.94–1.00
  • * Numbers between parentheses are aneurysms.