Table 2.
Comparison of sensitivity, specificity, positive and negative likelihood ratios, positive and negative predictive values and optimum cut-off points based on ROC in TRISS, ISS, RTS and REMS.
| -LR** | + LR* | Sensitivity (%) | Specificity (%) | NPV | PPV | Cut-off | |
|---|---|---|---|---|---|---|---|
| TRISS | 0.1911 | 2.6826 | 87.10% | 67.53% | 92.85% | 51.89% | <12 |
| ISS | 0.3171 | 2.0699 | 80.65% | 61.04% | 88.70% | 45.44% | >32 |
| RTS | 0.3240 | 2.0031 | 80.65% | 59.74% | 88.49% | 44.64% | <8 |
| REMS | 0.5596 | 2.0031 | 61.11% | 69.49% | 81.61% | 44.64% | >5 |
* + LR: Positive likelihood ratio = sensitivity/1-specificity; **- LR: Negative likelihood ratio = 1-sensitivity/specificity. NPV: Negative predictive value; PPV: Positive predictive value; ROC: Receiver operating characteristic. TRISS: Trauma and Injury Severity Score; ISS: Injury Severity Score; RTS: Revised Trauma Score; REMS: Rapid Emergency Medicine Score.