Table 4.
Model | P | A | P+A | B1 | P+A+B1 | B2 | P+A+B1+B2 | TRISS | RISC |
---|---|---|---|---|---|---|---|---|---|
Quality criteria | |||||||||
Discrimination | |||||||||
Prognosis survivors (S) | 12.5 | 11.5 | 10.7 | 10.7 | 9.6 | 10.5 | 9 | 11.9 | 10 |
Prognosis Non-survivors | 16.1 | 26.9 | 31 | 31 | 38.1 | 32.2 | 43.5 | 48.8 | 48 |
(N-S) | |||||||||
Difference between S | 3.6 | 15.4 | 20.3 | 20.3 | 28.5 | 21.7 | 34.5 | 36.9 | 38 |
and N-S | |||||||||
Sensitivity | 0.0 | 16.0 | 26.7 | 24.0 | 33.3 | 16.0 | 36.0 | 44.6 | 44.0 |
Specificity | 100.0 | 98.5 | 97.1 | 99.4 | 97.1 | 97.7 | 97.7 | 92.4 | 97.1 |
Overall accuracy | 87.4 | 88.0 | 88.2 | 89.9 | 89.1 | 87.4 | 89.9 | 87.7 | 90.4 |
Nagelkerkes R2 [24] | - | - | - | - | - | - | - | - | - |
AUC of ROC | 0.61 | 0.75 | 0.79 | 0.77 | 0.82 | 0.82 | 0.87 | 0.84 | 0.89 |
95% CI | 0.54-0.68 | 0.68-0.81 | 0.73-0.85 | 0.71-0.83 | 0.76-0.88 | 0.77-0.87 | 0.82-0.91 | 0.79-0.90 | 0.85-0.93 |
Precision | |||||||||
Observed mortality (%) | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 |
Score prognosis (%) | 13.0 | 13.4 | 13.3 | 13.3 | 13.2 | 13.3 | 13.4 | 16.5 | 14.8 |
Calibration | |||||||||
H-L [25] | n.a. | 3.96 | 4.68 | 4.66 | 6.92 | 11.04 | 6.01 | 35.60 | 8.34 |
p-value | n.a. | 0.138 | 0.322 | 0.200 | 0.230 | 0.137 | 0.420 | < 0.001 | 0.400 |
P Patients basic data; A Prehospital phase; B1 early trauma room phase; B2 late trauma room phase; TRISS trauma and injury severity score, RISC revised injury severity classification score; S survivors; N-S non-survivors; AUC area under the curve. ROC receiver operating characteristic; CI confidence interval; H-L Goodness of fit statistics according to Hosmer and Lemeshow [25]; n.a. not applicable