Skip to main content

Table 3 Quality parameter of the different models (n = 1,760, development data set)

From: The sequential trauma score - a new instrument for the sequential mortality prediction in major trauma*

Model P A P+A B1 P+A+B1 B2 P+A+B1+B2 TRISS RISC
Quality criteria          
Discrimination          
Prognosis survivors (S) 12.5 11.1 10.3 10.3 9.2 9.6 8 13.4 10
Prognosis non-survivors 16.8 25.9 31.2 31.2 38.7 33.8 46.9 49 48.8
(N-S)          
Difference between S 4.3 14.8 20.9 20.9 29.5 24.2 38.9 35.6 38.8
and n-S          
Sensitivity 0 13.0 23.5 25.2 34.3 18.3 40.9 47.4 43.5
Specificity 100 98.4 97.8 98.9 98.1 98.3 98.2 91.6 96.2
Overall accuracy 86.9 90.0 88.1 89.3 89.8 87.8 90.7 86.0 89.3
Nagelkerkes R2 [24] 0.07 0.21 0.29 0.27 0.38 0.34 0.49 n.a. n.a.
AUC of ROC 0.63 0.76 0.82 0.78 0.85 0.84 0.90 0.85 0.90
95% CI 0.59-0.67 0.72-0.79 0.79-0.85 0.75-0.82 0.82-0.88 0.81-0.87 0.88-0.92 0.82-0.88 0.89-0.92
Precision          
Observed mortality (%) 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1
Score prognosis (%) 13.1 13.1 13.1 13.1 13.1 13.1 13.1 18.0 15.1
Calibration          
H-l [25] n.a. 1.34 5.29 2.36 4.19 4.66 11.48 136.10 17.30
p-value n.a. 0.511 0.259 0.500 0.522 0.701 0.120 < 0.001 0.027
  1. 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