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Table 3 Adjusted Risk Ratios (95 % CI) for type and frequency of diagnostic imaging for all adult patients and specific patient sub-groups

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

Insurance Type

All imaging

p value

Imaging within first 24 hours

p value

CT imaging within first 24 hours

p value

Base Model (3621)a

 Commercial

[reference]

 

[reference]

 

[reference]

 

 Medicare

0.85 (0.78–0.93)

<0.001

0.78 (0.71–0.86)

<0.001

0.74 (0.66–0.82)

<0.001

 Medicaid

0.89 (0.81–0.99)

0.003

0.95 (0.85–1.06)

0.363

0.99 (0.87–1.12)

0.828

 No Insurance

0.90 (0.85–0.96)

<0.001

0.96 (0.89–1.03)

0.239

1.01 (0.93–1.09)

0.788

 Government

0.81 (0.72–0.90)

<0.001

0.83 (0.74–0.94)

0.003

0.85 (0.74–0.97)

0.019

Injury Severity Score > 15 (n = 596)b

 Commercial

[reference]

 

--

 

[reference]

 

 Medicare

0.86 (0.71–1.04)

0.122

0.85 (0.68–1.06)

0.145

0.84 (0.69–1.03)

0.093

 Medicaid

0.78 (0.68–0.94)

<0.001

0.82 (0.66–1.03)

0.091

0.98 (0.80–1.20)

0.849

 No Insurance

0.80 (0.71–0.91)

<0.001

0.84 (0.72–0.97)

0.016

1.02 (0.89–1.16)

0.785

 Government

0.64 (0.51–0.81)

<0.001

0.72 (0.55–0.94)

0.016

0.88 (0.69–1.12)

0.283

Injury Severity Score < 15 (n = 3025)b

 Commercial

[reference]

 

--

 

[reference]

 

 Medicare

0.82 (0.74–0.91)

0.001

0.75 (0.67–0.84)

<0.001

0.71 (0.62–0.81)

<0.001

 Medicaid

0.93 (0.82–1.05)

0.237

0.97 (0.84–1.11)

0.641

0.96 (0.82–1.13)

0.642

 No Insurance

0.94 (0.87–1.01)

0.094

0.99 (0.91–1.07)

0.795

1.00 (0.91–1.10)

0.957

 Government

0.84 (0.74–0.95)

0.007

0.85 (0.74–0.97)

0.021

0.83 (0.71–0.98)

0.027

Blunt force mechanism (n = 3058)c

 Commercial

[reference]

 

[reference]

 

[reference]

 

 Medicare

0.82 (0.76–0.89)

<0.001

0.77 (0.70–0.84)

<0.001

0.72 (0.65–0.79)

<0.001

 Medicaid

0.82 (0.74–0.90)

<0.001

0.91 (0.82–1.02)

0.109

0.99 (0.88–1.12)

0.900

 No Insurance

0.88 (0.83–0.94)

<0.001

0.94 (0.88–1.01)

0.085

1.01 (0.94–1.09)

0.795

 Government

0.82 (0.74–0.91)

<0.001

0.85 (0.76–0.96)

0.006

0.85 (0.75–0.97)

0.015

  1. a- adjusted for age, sex, race/ethnicity, injury severity score, injury mechanism, comorbidity, complications, and hospital LOS
  2. b- adjusted for age, sex, race/ethnicity, injury mechanism, comorbidity, complications, hospital LOS, and ICU admission
  3. c- adjusted for age, sex, race/ethnicity, injury severity score, comorbidity, complications, ICU admission, and hospital LOS