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

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

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

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

ISSN: 1757-7241