title: Comparison of the New Injury Severity Score and the Injury Severity Score.
abstract: 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.
authors.affiliation: Department of Emergency Medicine, University of Illinois at Chicago, USA. seow_yian_tay@ttsh.com.sg
authors.forename: Seow-Yian
authors.initials: SY
authors.lastname: Tay
authors.forename: Edward P
authors.initials: EP
authors.lastname: Sloan
authors.forename: Leslie
authors.initials: L
authors.lastname: Zun
authors.forename: Philip
authors.initials: P
authors.lastname: Zaret
mesh_terms: 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