Table 3. Secondary Outcomes.

Outcome	Cohort	Effect size (95% CI)	P value
Unadjusted analyses
Hospital LOS, IRR	Full	1.17 (1.08-1.26)	<.001
	Confirmed TBI	1.12 (1.03-1.22)	.009
	Isolated TBI	0.91 (0.75-1.10)	.32
GOS score at discharge, OR	Full	0.70 (0.65-0.76)	<.001
	Confirmed TBI	0.72 (0.63-0.82)	<.001
	Isolated TBI	0.61 (0.48-0.78)	<.001
12-mo Mortality, OR	Full	1.29 (1.10-1.50)	.001
	Confirmed TBI	1.28 (1.07-1.53)	.007
	Isolated TBI	1.74 (1.34-2.25)	<.001
Adjusted analyses, original data set
Hospital LOS, IRR	Full	0.92 (0.81-1.04)	.17
	Confirmed TBI	0.89 (0.77-1.03)	.11
	Isolated TBI	0.71 (0.54-0.95)	.02
GOS score at discharge, OR	Full	1.05 (0.81-1.37)	.71
	Confirmed TBI	0.97 (0.72-1.30)	.83
	Isolated TBI	0.68 (0.25-1.90)	.47
12-mo Mortality, OR	Full	1.08 (0.66-1.76)	.76
	Confirmed TBI	1.04 (0.60-1.79)	.89
	Isolated TBI	3.31 (1.20-9.16)	.02
Adjusted analyses, after multiple imputations
Hospital LOS, IRR	Full	1.05 (0.92-1.20)	.44
	Confirmed TBI	1.04 (0.88-1.22)	.65
	Isolated TBI	0.88 (0.69-1.11)	.27
GOS score at discharge, OR	Full	0.97 (0.78-1.21)	.79
	Confirmed TBI	0.86 (0.72-1.04)	.13
	Isolated TBI	0.69 (0.42-1.14)	.15
12-mo Mortality, OR	Full	0.99 (0.77-1.29)	.96
	Confirmed TBI	0.99 (0.75-1.30)	.93
	Isolated TBI	1.78 (1.13-2.80)	.01

Abbreviations: GOS, Glasgow Outcome Scale; IRR, incidence rate ratio; LOS, length of stay; OR, odds ratio; TBI, traumatic brain injury.