Ingalls et al performed a retrospective review of the US military Critical Care Air Transport Team (2,899 transport records) and Joint Theater Trauma Registry databases, involving centres in Iraq, Afghanistan, and Germany, with 975 individuals having all required data, and found:
  1. mean Injury Severity Score of 23.7
  2. 30-day mortality of 2.1%
  3. in transit mortality < 0.02%
  4. survivors had lower measures of physiological derangement
    • Injury Severity Score (mean 23.4 [12.4] vs 37.7 [16.5]; P < 0.001)
    • worst base deficit (mean −3.4 [5.0] vs −7.8 [6.9]; P =0 .02)
    • worst international normalized ratio (median 1.2 [1.0-1.4] vs 1.4 [1.1-2.2]; P  = 0.03)
    • cumulative volume of blood transfused among the patients in each group who received a transfusion (P < 0.001)
  5. no difference between survivors and decedents with respect to time from injury to arrival at definitive care