Results of the readings–veins
| Venous Structure | Blinded Readings | Consensus Reading | Intraobserver Agreement (κ values) | Sensitivity (95% CI)* | Specificity (95% CI)* | |||
|---|---|---|---|---|---|---|---|---|
| Dense Vein Sign | tp | fp | tn | fn | ||||
| SS | 24 | 23 | 1 | 185 | 1 | 0.96 | 95.8 (85.6–98.9) | 99.5 (98.1–99.9) |
| LICV | 19 | 18 | 1 | 182 | 3 | 0.92 | 85.7 (72.7–89.6) | 99.5 (98–99.9) |
| RICV | 24 | 23 | 1 | 182 | 1 | 0.96 | 95.8 (85.6–98.9) | 99.5 (98.1–99.8) |
| VG | 24 | 23 | 1 | 182 | 1 | 0.96 | 95.8 (85.6–98.9) | 99.5 (98.1–99.8) |
| LBVR | 11 | 11 | 0 | 195 | 1 | 0.98 | 91.7 (74.9–91.7) | 100 (99–100) |
| RBVR | 14 | 14 | 0 | 192 | 1 | 0.98 | 93.3 (79.6–93.3) | 100 (98.9–100) |
| LTSV | 13 | 12 | 1 | 194 | 0 | 0.98 | 100 (83–100) | 99.5 (98.4–99.5) |
| RTSV | 9 | 5 | 4 | 197 | 1 | 0.90 | 83.3 (47.6–96.9) | 98 (96.9–98.4) |
| Total | 138 | 129 | 9 | 1509 | 9 | 0.958 | 93.5 (89.9–95.9) | 99.4 (99.1–99.6) |
Note:—tp indicates true-positive; fp, false-positive; tn, true-negative; fn, false-negative; 95% CI, 95% confidence interval; LICV, left internal cerebral vein; RTSV, right thalamostriate vein.
* Data are given in percentages.