Table 4.

Receipt of CT or MRI. A multivariate logistic regression model to determine the influence of patient’s age, year of visit, type of insurance, and region of the country

Variable	OR	95%CI
Age (years)	1.04	1.02, 1.05
Year
2002	Reference
2003	1.26	0.67, 2.37
2004	1.62	0.85, 3.07
2005	2.07	1.10, 3.88
2006	2.68	1.45, 4.95
Insurance
Private insurance	Reference
Medicare	0.62	0.36, 1.05
Medicaid/SCHIP	0.52	0.31, 0.87
Workers compensation	0.45	0.20, 1.04
Self-pay (Uninsured)	0.25	0.12, 0.51
No charge/charity	0.26	0.07, 0.96
Other	0.51	0.18, 1.47
Geographic region
West	Reference
Northeast	1.76	0.95, 3.26
Midwest	1.37	0.73, 2.60
South	1.35	0.75, 2.44