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An overview of the injury severity score and the new injury severity score
M Stevenson1, M Segui-Gomez, I Lescohier
1Harvard Injury Control Research Center, Harvard School of Public Health, Boston, USA. mark@health.curtin.edu.au
Objective:
The research was undertaken to describe the injury severity score (ISS) and the new injury severity score (NISS) and to illustrate their statistical properties.
Design:
Descriptive analysis and assessment of the distribution of these scales.
Methods:
Three data sources--the National Pediatric Trauma Registry; the Massachusetts Uniform Hospital Discharge Data Set; and a trauma registry from an urban level I trauma center in Massachusetts--were used to describe the distribution of the ISS and NISS among injured patients.
Results:
The ISS/NISS was found to have a positively skewed distribution and transformation did not improve their skewness.
Conclusion:
The findings suggest that for statistical or analytical purposes the ISS/ NISS should not be considered a continuous variable, particularly if ISS/NISS is treated as a continuous variable for correlation with an outcome measure.
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