Performance Assessment on each of the 4 models by using the sensitivity, specificity, accuracy, and area under the ROC curve
| ROC analysis | mTRISS; based on coefficients derived from QEH dataset | ||||
|---|---|---|---|---|---|
| Model 1* | Model 2† | Model 3‡ | Model 4§ | eTRISS coefficients derived from MTOS | |
| Sensitivity % | 97.5 | 97.3 | 97.2 | 97.5 | 97.3 |
| Specificity % | 52.0 | 48.9 | 51.6 | 49.5 | 34.1 |
| Accuracy % | 91.6 | 91.1 | 91.3 | 91.4 | 89.2 |
| Area under the ROC (95% CI) | 0.932 (0.923 to 0.940) | 0.920 (0.910 to 0.930) | 0.927 (0.917 to 0.936) | 0.923 (0.913 to 0.933) | 0.886 (0.873 to 0.898) |
| Hosmer and Lemeshow goodness-of-fit (p value) | 0.402 | 0.038 | 0.050 | 0.070 | |
*Age=scale variable.
†Age into two groups (0–54, 55+) that is, MTOS TRISS with new QEH coefficients.
‡Age into four groups (0–15, 16–54, 55–79, 80+).
§Age into two groups (0–69, 70+).
MTOS, Major Trauma Outcome Study; QEH, The Queen Elizabeth Hospital; ROC, Receiver operator characteristic; TRISS, Trauma and Injury Severity Score.