| Severely injured | Not severely injured | Total |
---|
TTA | (a) | (b) | (a + b) |
No TTA | (c) | (d) | (c + d) |
Total | (a + c) | (b + d) | (n) |
- Sensitivity = a/(a + c); Specificity = d/(b + d)
- Positive predictive value (PPV) = a/(a + b)
- Undertriage = 1 - Sensitivity = c/(a + c); Overtriage = 1 - PPV = b/(a + b)