Modality | Size of aneurysm | Sensitivity (95% CI) (TP/TP+FN) | Specificity (95% CI) (TN/TN+FP) | |
CTA+TCD3-150 | <3 mm | 0.00 (0.00–0.31) (0/10) | — | |
(64 “uncertain”) | 3–5 mm | 0.43 (0.23–0.66) (10/23) | — | |
5.1–10 mm | 0.71 (0.29–0.96) (5/7) | — | ||
>10 mm | 1.00 (0.59–1.00) (7/7) | — | ||
All | 0.47 (0.32–0.62) (22/47) | 0.95 (0.86–0.99) (58/61) | ||
MRA+TCD3-150 | <3 mm | 0.00 (0.00–0.22) (0/15) | — | |
(55 “uncertain”) | 3–5 mm | 0.26 (0.10–0.48) (6/23) | — | |
5.1–10 mm | 0.63 (0.24–0.91) (5/8) | — | ||
>10 mm | 1.00 (0.54–1.00) (10/10) | — | ||
All | 0.38 (0.25–0.51) (21/56) | 0.97 (0.89–1.00) (61/63) | ||
CTA+MRA | <3 mm | 0.20 (0.04–0.48) (3/15) | 0.98 (0.91–1.00) (61/62) | |
(34 “uncertain”) | 3–5 mm | 0.50 (0.31–0.69) (15/30) | 1.00 (0.94–1.00) (61/61) | |
5.1–10 mm | 0.89 (0.52–1.00) (8/9) | 1.00 (0.94–1.00) (61/61) | ||
>10 mm | 1.00 (0.69–1.00) (10/10) | 1.00 (0.94–1.00) (61/61) | ||
All | 0.56 (0.43–0.69) (36/64) | 0.98 (0.91–1.00) (61/62) |
“Uncertain” indicates that the tests disagreed about the presence of an aneurysm.
↵3-150 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.