Table 3. Unadjusted and Adjusted Means of the Composite Overuse Score Across Hospitals.

Hospital characteristic	Composite scores for cohort A			Composite scores for cohort B
	Mean (SD)	Adjusted mean (95% CI)a	P valueb	Mean (SD)	Adjusted mean (95% CI)	P value
Safety net status
Non–safety net	0.4 (0.1)	0.4 (0.4-0.4)	.32	0.4 (0.1)	0.4 (0.4-0.41)	.06
Safety net	0.4 (0.12)	0.4 (0.39-0.41)		0.39 (0.1)	0.4 (0.39-0.42)
Ownership type
For profit	0.45 (0.09)	0.42 (0.41-0.43)	<.001	0.45 (0.08)	0.42 (0.41-0.43)	<.001
Nonprofit	0.39 (0.1)	0.39 (0.39-0.4)		0.39 (0.1)	0.4 (0.39-0.4)
Teaching class
Major teaching	0.3 (0.08)	0.32 (0.3-0.33)	<.001	0.31 (0.08)	0.32 (0.31-0.33)	<.001
Minor teaching	0.38 (0.1)	0.39 (0.38-0.39)		0.4 (0.09)	0.4 (0.39-0.41)
Nonteaching	0.42 (0.1)	0.42 (0.41-0.42)		0.44 (0.09)	0.43 (0.43-0.44)
Hospital size
≥200 beds	0.38 (0.1)	0.39 (0.38-0.4)	.02	0.39 (0.1)	0.4 (0.39-0.4)	.23
6-199 beds	0.42 (0.1)	0.41 (0.4-0.41)		0.43 (0.09)	0.41 (0.4-0.42)
CBSA type
Urban	0.39 (0.1)	0.4 (0.4-0.41)	.60	0.4 (0.1)	0.4 (0.4-0.41)	.30
Suburban	0.41 (0.09)	0.39 (0.38-0.4)		0.44 (0.1)	0.4 (0.39-0.42)
Rural	0.41 (0.11)	0.38 (0.37-0.4)		0.41 (0.04)	0.38 (0.29-0.46)
Region
Midwest	0.38 (0.09)	0.39 (0.38-0.39)	<.001	0.38 (0.09)	0.39 (0.38-0.4)	<.001
Northeast	0.35 (0.09)	0.37 (0.36-0.37)		0.36 (0.09)	0.38 (0.37-0.39)
South	0.45 (0.09)	0.44 (0.44-0.45)		0.44 (0.09)	0.43 (0.43-0.44)
West	0.37 (0.1)	0.36 (0.35-0.37)		0.38 (0.1)	0.37 (0.36-0.38)

Abbreviation: CBSA, core-based statistical area.

^aAdjusted means are based on linear regression using all hospital characteristics.

^bComparison P value is from the analysis of variance comparison of the linear regression model and tests whether the hospital characteristic is significant in this model.