J Med Assoc Thai 2001; 84 (10):1416

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A Comparison of Mortality Predictive Abilities Between NISS and ISS in Trauma Patients
Jamulitrat S Mail, Sangkerd P , Thongpiyapoom S , Narong MN

Previously published investigations have suggested that the Injury Severity Score (ISS)
can be replaced by the New Injury Severity Score (NISS) which takes into account the three most
severe injuries regardless of body region. This study was conducted to evaluate whether NISS can
also give a better mortality prediction than ISS in a different setting. The objective of this study
was to compare the accuracy between ISS and NISS in predicting mortality of trauma patients.
The study population consisted of trauma patients admitted to a 650-bed university hospital in
Thailand from June 1996 to May 1999. Data of patients admitted to the hospital were prospectively
collected to identify the injuries and outcomes of treatment. Each injury was reviewed and coded
according to the Abbreviated Injury Scale 1990 revision (AIS-90) and computed for ISS and NISS.
Areas under receiver operating characteristic (ROC) curves were employed to compare the abilities
of the ISS and the NISS in predicting patients' mortality. The results of the study showed that 2,044
trauma patients were admitted to the hospital during the three-year study period and 114 patients
died in the hospital. The median scores of the ISS and the NISS of the survivors were 4 and 8
respectively. The median scores of the ISS and the NISS of the non-survivors were 25 and 38
respectively. The area under ROC curve derived from the ISS (0.966; 95%C.I
0.965 -0.967) was
0.05) less than the NISS (0.974; 95%C.I
0.973 -0.975). We concluded, under
our setting, that NISS also performed the mortality prediction in trauma patients better than ISS
and confirmed the results of the previous studies.
Key word : Severity of Illness Index, Severity Score, Trauma, Injury

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