Table 5 Calculations of dispatch sensitivity, specificity, PPV, NPV, FNR, FPR and accuracy
From: EMCC dispatch priority for trauma patients in Norway: a retrospective cohort study
Parameter | Formula | n | Value | Per cent |
|---|---|---|---|---|
Sensitivity | \(\frac{TP}{{TP + FN}}\) | \(\frac{872}{{872 + 156}}\) | 0.85 | 85 |
Specificity | \(\frac{TN}{{TN + FP}}\) | \(\frac{175}{{175 + 1441}}\) | 0.11 | 11 |
PPV | \(\frac{TP}{{TP + FP}}\) | \(\frac{872}{{872 + 1441}}\) | 0.38 | 38 |
NPV | \(\frac{TN}{{TN + FN}}\) | \(\frac{175}{{175 + 156}}\) | 0.53 | 53 |
FNR | 1—sensitivity | 1—0.85 | 0.15 | 15 |
FPR | 1—specificity | 1—0.11 | 0.89 | 89 |
Accuracy | \(\frac{TP + TN}{{TP + TN + FP + FN}}\) | \(\frac{872 + 175}{{872 + 175 + 1441 + 156}}\) | 0.40 | 40 |