Table 5.

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

	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)

The results are expressed as means with 95% confidence intervals