Variation in type and frequency of diagnostic imaging during trauma care across multiple time points by patient insurance type

Table 4 Adjusted Risk Ratios (95 % CI) for type and frequency of selected computed tomography imagery by patient insurance type

	Computed Tomography type
Insurance Type	Abdomen and pelvis w/contrast	p value	Chest/abdomen/pelvis w/contrast	p value	Cervical spine w/reconstruction	p value	Facial bones w/out contrast	p value	Head w/out contrast	p value
Base Model (n = 3621)^a
Commercial	[reference]		[reference]		[reference]		[reference]		[reference]
Medicare	0.60 (0.48–0.65)	<0.001	0.55 (0.47–0.63)	<0.001	0.78 (0.67–0.90)	0.001	0.85 (0.64–1.12)	0.250	0.95 (0.85–1.07)	0.392
Medicaid	0.93 (0.79–1.09)	0.366	0.93 (0.79–1.09)	0.352	1.03 (0.87–1.22)	0.745	1.24 (0.92–1.67)	0.151	1.02 (0.89–1.17)	0.794
No Insurance	0.96 (0.87–1.05)	0.357	0.95 (0.86–1.05)	0.288	1.04 (0.94–1.15)	0.479	1.19 (0.99–1.43)	0.058	1.06 (0.98–1.16)	0.152
Government	0.78 (0.65–0.92)	0.004	0.79 (0.66–0.94)	0.008	0.92 (0.77–1.10)	0.339	0.87 (0.62–1.22)	0.407	0.92 (0.79–1.07)	0.261

^a- adjusted for age, sex, race/ethnicity, injury severity score, injury mechanism, comorbidity, complications, ICU admission, and hospital LOS

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