Table 4.

Change in CABG Rates by Risk of Mortality and Overall in Premier vs. Non-Premier Hospitals

	Premier Hospitals				Non-Premier Hospitals				Difference in Change (Premier vs. Non- Premier)
	2002–2003	2008–2009	Change	P-Value	2002–2003	2008–2009	Change	P-Value	Difference (95% CI)	P-Value
High Risk	8.4%	8.2%	−0.2%	0.70	8.4%	8.3%	−0.1%	0.77	0.2 (−1.2, 1.5)	0.82
Low Risk	14.0%	10.5%	−3.5%	<0.001	14.0%	10.6%	−3.3%	<0.001	0.2 (−0.6, 0.9)	0.66
All	13.6%	10.4%	−3.2%	<0.001	13.6%	10.6%	−3.0%	<0.001	0.2 (−0.6, 0.9)	0.67

Results adjusted for age, sex, 28 Elixhauser comorbidities, type of myocardial infarction, and hospital characteristics (size, region, profit status, teaching status, proportion of Medicare patients, margin and location in a competitive market)