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Table 3 ISS, NISS, polytrauma, and physiologic scores, by sub-group analysis of ISS regions

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

ISS region (AIS score of 3 or more) Model variables (all include age, gender, and Charlson score) Polytrauma OR (95 % CI) Poly-trauma P-value C-statistic Model variables (all include age, gender, and Charlson score) Polytrauma OR (95 % CI) Poly-trauma P-value C-statistic
Head and Neck ISS - - 0.849 NISS - - 0.877
ISS + RTS - - 0.898 NISS + RTS - - 0.915
ISS + Polytrauma 0.62 (0.46, 0.85) 0.003 0.850 NISS + Polytrauma 2.49 (1.92, 3.25) <0.001 0.882
ISS + Polytrauma + RTS 0.63 (0.44, 0.89) 0.008 0.899 NISS + Polytrauma + RTS 1.83 (1.36, 2.47) <0.001 0.916
Chest ISS - - 0.901 NISS - - 0.929
ISS + RTS - - 0.935 NISS + RTS - - 0.941
ISS + Polytrauma 1.64 (0.95, 2.83) 0.077 0.900 NISS + Polytrauma 2.22 (1.36, 3.60) 0.001 0.915
ISS + Polytrauma + RTS 1.35 (0.74, 2.44) 0.325 0.934 NISS + Polytrauma + RTS 1.66 (0.97, 2.82) 0.062 0.941
Abdomen ISS - - 0.926 NISS - - 0.933
ISS + RTS - - 0.949 NISS + RTS - - 0.954
ISS + Polytrauma 2.24 (0.68, 7.4) 0.186 0.929 NISS + Polytrauma 3.43 (1.05, 11.28) 0.042 0.951
ISS + Polytrauma + RTS 2.52 (0.73, 8.71) 0.143 0.948 NISS + Polytrauma + RTS 1.62 (0.89, 2.94) 0.111 0.958
Extremity ISS -   0.886 NISS -   0.870
ISS + RTS -   0.900 NISS + RTS -   0.891
ISS + Polytrauma 0.99 (0.47, 2.09) 0.98 0.886 NISS + Polytrauma 2.02 (1.08, 3.80) 0.028 0.870
ISS + Polytrauma + RTS 1.14 (0.52, 2.48) 0.72 0.900 NISS + Polytrauma + RTS 2.02 (1.02, 4.01) 0.044 0.891
  1. Abbreviations: AIS Abbreviated Injury Scale, CI 95 % confidence interval, ISS Injury Severity Score, NISS New Injury Severity Score, OR odds ratio, RTS Revised Trauma Score