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Table 6 Survival benefit of HEMS measured by TRISS and RISC in the subgroup of level I trauma centers at daytime

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 2,294 2,156  
Expected mortality 20.7% 18.1% -
Observed mortality 13.4% 14.7%  
Standardized Mortality Ratio (95% CI) 0.647 (0.579 to 0.714) 0.815 (0.732 to 0.897) 0.002
RISC  
Number of cases 3,577 3,720  
Expected mortality 18.4% 17.9% -
Observed mortality 14.2% 15.5%  
Standardized Mortality Ratio (95%-CI) 0.772 (0.710 to 0.834) 0.864 (0.799 to 0.928) 0.045
  1. Only cases with sufficient data for calculation of score values were considered.