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Table 2: 
Diagnostic performance of CT angiography according to aneurysm size
Aneurysm SizeSensitivity, % (n/N)Specificity, % (n/N)Positive Predictive Value, % (n/N)Negative Predictive Value, % (n/N)
<3 mm
    Reader 163.6 (7/11)100 (6/6)100 (7/7)60 (6/10)
    Reader 281.8 (9/11)100 (6/6)100 (9/9)75 (6/8)
    Reader 363.6 (7/11)85.6 (6/7)87.5 (7/8)60 (6/10)
    Reader 472.7 (8/11)85.6 (6/7)88.8 (8/9)66.7 (6/9)
≥3 mm
    Reader 198.2 (55/56)100 (6/6)100 (55/55)85.6 (6/7)
    Reader 296.4 (54/56)100 (6/6)100 (54/54)75 (6/8)
    Reader 3100 (56/56)100 (6/6)100 (56/56)100 (6/6)
    Reader 4100 (56/56)85.6 (6/7)98.2 (56/57)100 (6/6)
  • Note:—Numbers in parentheses indicate numbers of aneurysms.