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Table 5 Distribution of assumed explanatory variables for trauma death by time cohorts.

From: Prehospital trauma care reduces mortality. Ten-year results from a time-cohort and trauma audit study in Iraq

  Time period 1 Time period 2 Time period 3
Age (years) 26.8 (25.3 - 28.4) 24.2 (22.9 - 25.6) 25.9 (25.2 - 26.6)
ISS 11.0 (9.9 - 12.1) 6.1 (5.5 - 6.7) 7.1 (6.8 - 7.4)
PSS-1 8.8 (8.4 - 9.2) 10.2 (10.0 - 10.4) 9.8 (9.7 - 9.9)
PSS-2 11.6 (11.5 - 11.7) 11.5 (11.4 - 11.6) 11.3 (11.2 - 11.4)
In-field response time (hours) 1.6 (1.2 - 1.9) 0.9 (0.8 - 1.0) 0.65 (0.6 - 0.7)
Total evacuation time (hours) 4.4 (3.8 - 5.0) 3.6 (3.3 - 3.9) 2.3 (2.2 - 2.4)
  1. The results are expressed as means with 95% confidence intervals