Ability of “experienced” clinicians to recognise features of early infarct on CT
| What the ECASS book said | Present | Present | Absent | Absent | Specificity | Sensitivity | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| What the experienced clinicians said | Present | Absent | Present | Absent | ||||||||||||
| Feature | ||||||||||||||||
| Dense MCA | 12 | 19 | 0 | 41 | 1.00 | 0.39 | ||||||||||
| Loss of basal ganglia outline | 17 | 31 | 8 | 16 | 0.67 | 0.35 | ||||||||||
| Loss of insular ribbon | 11 | 43 | 2 | 16 | 0.89 | 0.20 | ||||||||||
| Hypodensity | 23 | 49 | 0 | 0 | — | 0.32 | ||||||||||
| Effacement of sulci | 10 | 32 | 1 | 29 | 0.97 | 0.24 | ||||||||||
| Ventricular effacement | 6 | 24 | 2 | 40 | 0.95 | 0.20 | ||||||||||
The numbers are the absolute number of observations by the six experienced observers on the 12 “abnormal” scans (72 observations in all).