Table 3: Differences in trauma centre-specific adjusted mortality rates, overall and across patient subgroups in Ontario, 2005–2011*.

Trauma centre	Overall, adjusted† mortality rate (95% CI)	Patient subgroup, adjusted† mortality rate (95% CI)
		Shock	Penetrating truncal injury	Blunt multisystem injury	Older (≥ 65 yr)	Isolated severe TBI
1	0.72 (0.60–0.87)	0.81 (0.60–1.09)	1.25 (0.83–1.89)	0.74 (0.56–0.98)	0.72 (0.54–0.96)	0.46 (0.33–0.64)
2	0.87 (0.69–1.12)	0.91 (0.63–1.30)	1.00 (0.58–1.73)	0.74 (0.47–1.16)	0.58 (0.39–0.85)	0.73 (0.49–1.10)
3	0.87 (0.70–1.08)	0.99 (0.70–1.41)	0.84 (0.49–1.44)	1.20 (0.83–1.75)	0.95 (0.69–1.29)	1.05 (0.74–1.50)
4	0.87 (0.69–1.01)	1.09 (0.76–1.55)	0.98 (0.57–1.68)	0.81 (0.54–1.21)	0.84 (0.60–1.18)	0.82 (0.56–1.19)
5	0.89 (0.73–1.07)	1.05 (0.77–1.43)	0.90 (0.58–1.39)	0.79 (0.58–1.07)	0.84 (0.63–1.12)	0.79 (0.58–1.09)
6	1.18 (0.98–1.43)	1.14 (0.82–1.57)	1.16 (0.70–1.93)	1.18 (0.87–1.60)	1.19 (0.90–1.56)	1.43 (1.05–1.94)
7	1.17 (0.97–1.41)	1.08 (0.79–1.48)	1.14 (0.69–1.88)	1.40 (1.04–1.87)	1.30 (0.98–1.72)	1.39 (1.01–1.90)
8	1.23 (0.99–1.53)	1.05 (0.75–1.48)	0.95 (0.55–1.62)	0.82 (0.57–1.19)	1.51 (1.11–2.08)	1.46 (1.02–2.09)
9	1.38 (1.14–1.68)	0.93 (0.67–1.28)	0.86 (0.51–1.43)	1.75 (1.29–2.38)	1.52 (1.14–2.03)	1.55 (1.11–2.16)
Median odds ratio	1.25	1.21	1.32	1.39	1.40	1.47

Note: CI = confidence interval, TBI = traumatic brain injury.
*Light gray shading shows trauma centres with upper limits of the 95% confidence interval for in-hospital mortality rate < 1 (lower than expected mortality, i.e., lower adjusted likelihood of death compared with the other centres). Darker shading shows trauma centres with lower limits of the confidence interval > 1 (significantly higher than expected mortality).
†Adjusted for gender, age, mechanism of injury, vital signs on arrival, injury severity and transfer status (as defined in Box 1).