Table 2

Diagnostic performance per aneurysm for non-invasive imaging tests

Modality Size of
aneurysm
Sensitivity (95% CI) (TP/TP+FN) Specificity (95% CI) (TN/TN+FP)
CTA<3 mm0.40 (0.19–0.64) (8/20)0.91 (0.82–0.97) (63/69)
3–5 mm0.56 (0.40–0.72) (22/39)0.88 (0.78–0.94) (63/72)
5.1–10 mm0.83 (0.52–0.98) (10/12)0.98 (0.91–1.00) (63/64)
>10 mm1.00 (0.72–1.00) (11/11)1.00 (0.94–1.00) (63/63)
All sizes0.62 (0.51–0.73) (51/82)0.80 (0.69–0.88) (63/77)
MRA<3 mm0.15 (0.03–0.38) (3/20)0.93 (0.85–0.98) (67/72)
3–5 mm0.38 (0.23–0.55) (15/39)0.99 (0.92–1.00) (67/68)
5.1–10 mm0.75 (0.43–0.95) (9/12)1.00 (0.95–1.00) (67/67)
>10 mm0.91 (0.59–1.00) (10/11)1.00 (0.95–1.00) (67/67)
All sizes0.45 (0.34–0.57) (37/82)0.92 (0.83–0.97) (67/73)
TCD2-150 <3 mm0.15 (0.03–0.38) (3/20)
3–5 mm0.36 (0.21–0.53) (14/39)
5.1–10 mm0.42 (0.15–0.72) (5/12)
>10 mm0.64 (0.31–0.89) (7/11)
All sizes0.35 (0.25–0.47) (29/82)0.73 (0.63–0.82) (63/86)
  • 2-150 For TCD, size categorisation was not available for all the false positive cases; therefore, specificity and accuracy could not be determined by aneurysm size category.