| CT results | |
---|
+ | − | Total |
---|
SNC guideline | CT | 35 | 416 | 451 |
No CT | 1 | 210 | 211 |
| Total | 36 | 626 | 662 |
- Overall, a 32 % reduction in CT scanning was observed if SNC guidelines were used; 1 missed patient (low-risk mild with S100B ≤0.10 μg/L), see text for details; Prevalence of CT findings: 5 %; Sensitivity: 97 % (95 % CI, 84–100 %); Specificity: 34 % (95 % CI, 30–37 %); Negative predictive value, 100 % (95 % CI, 97–100 %); Positive predictive value, 8 % (95 % CI, 6–11 %)