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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.