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Table 5 Survival benefit of HEMS measured by TRISS and RISC

From: Survival benefit of helicopter emergency medical services compared to ground emergency medical services in traumatized patients

  HEMS GEMS P-value
TRISS  
Number of cases 2,949 4,467  
Expected mortality 20.4% 17.5% -
Observed mortality 13.8% 14.4%  
Standardized Mortality Ratio (95% CI) 0.678 (0.617 to 0.739) 0.825 (0.766 to 0.884) 0.0011
RISC  
Number of cases 4,575 7,469  
Expected mortality 18.3% 17.2% -
Observed mortality 14.6% 14.9%  
Standardized Mortality Ratio (95% CI) 0.798 (0.742 to 0.854) 0.869 (0.822 to 0.916) 0.062