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Table 2 ISS, NISS, polytrauma, and physiologic scores

From: Combining the new injury severity score with an anatomical polytrauma injury variable predicts mortality better than the new injury severity score and the injury severity score: a retrospective cohort study

Model Variables (all include age, gender, and Charlson score) OR for ISS or NISS (95 % CI) OR for polytrauma, anatomical definition, yes/no (95 % CI) OR for RTS (95 % CI) C-statistic
1a ISS 1.17 (1.16, 1.18) ** - - 0.887
1b NISS 1.11 (1.10, 1.11) ** - - 0.902
2a ISS + RTS 1.12 (1.11, 1.14)** - 0.40 (0.37, 0.43)** 0.918
2b NISS + RTS 1.08 (1.08, 1.09)** - 0.44 (0.41, 0.48)** 0.926
3a ISS + polytrauma 1.18 (1.17, 1.20)** 0.60 (0.46, 0.79)** - 0.887
3b NISS + polytrauma 1.10 (1.10, 1.11)** 2.48 (1.98, 3.11)** - 0.904
4a ISS + RTS + polytrauma 1.13 (1.12, 1.15)** 0.69 (0.51, 0.93)* 0.40 (0.37, 0.43)** 0.918
4b NISS + RTS + polytrauma 1.08 (1.07, 1.09)** 1.98 (1.53, 2.54)** 0.45 (0.42, 0.49)** 0.928
5a ISS + GCS + SBP + polytrauma 1.14 (1.12, 1.15)** 0.70 (0.52, 0.93)* - 0.913
5b NISS + GCS + SBP + polytrauma 1.08 (1.07, 1.09)** 1.98 (1.54, 2.54)** - 0.924
  1. *p < 0.05 **p < 0.001
  2. Abbreviations: CI 95 % confidence interval, GCS Glasgow Coma Scale, ISS Injury Severity Score, NISS New Injury Severity Score, OR odds ratio, RTS Revised Trauma Score, SBP Systolic blood pressure