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Comparison of the New Injury Severity Score and the Injury Severity Score

2004; Lippincott Williams & Wilkins; Volume: 56; Issue: 1 Linguagem: Inglês

10.1097/01.ta.0000058311.67607.07

1529-8809

Seow-Yian Tay, Edward P. Sloan, Leslie S. Zun, Philip Zaret,

Emergency and Acute Care Studies

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). Conclusion The NISS should not replace the ISS, as they share similar accuracy and calibration.