Comparison of the New Injury Severity Score and the Injury Severity Score.
BACKGROUND
The New Injury Severity Score (NISS) was proposed in 1997 to replace the Injury Severity Score (ISS) because it is more sensitive for mortality. We aim to test whether this is true in our patients.


METHODS
This study was a retrospective review of data from 6,231 consecutive patients over 3 years in the trauma registry of a Level I trauma center studying outcome, ISS, and NISS.


RESULTS
Misclassification rates were 3.97% for the NISS and 4.35% for the ISS. The receiver operating characteristic curve areas were 0.936 and 0.94, respectively. Neither the ISS nor the NISS were well calibrated (Hosmer-Lemeshow statistic, 36.11 and 49.28, respectively; p < 0.001).


CONCLUSIONS
The NISS should not replace the ISS, as they share similar accuracy and calibration.
Tay
Seow-Yian
SY
Department of Emergency Medicine, University of Illinois at Chicago, USA. seow_yian_tay@ttsh.com.sg
Sloan
Edward P
EP
Zun
Leslie
L
Zaret
Philip
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D002641:Chicago; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D015601:Injury Severity Score; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012042:Registries; D012189:Retrospective Studies; D014193:Trauma Centers; D014947:Wounds and Injuries / Q000145:classification* / Q000209:etiology / Q000401:mortality