Table 2.

Correlation of 1st and 2nd principal components of Ridit scores from 2010 with select 2011 Hospital Compare measures in 4629 hospitals

Measure	Including patient experience in principal component analysisa		Excluding patient experience from principal component analysisb
	Correlation with 1st principal component	Correlation with 2nd principal component	Correlation with 1st principal component	Correlation with 2nd principal component
Heart failure mortality (count)	0.43	0.42	0.59	−0.26
Heart failure mortality rate	−0.15	−0.03	−0.12	0.07
Always receive help	−0.73	0.12	−0.36	0.02
Usually receive help	0.65	0.03	0.38	−0.01
Heart attack patients given aspirin at arrival	0.17	0.19	0.25	−0.01

^aIncludes all 71 indicator variables: 20 structural measures, 26 clinical process measures, 6 patient readmission and mortality rates, and 19 patient experience indicators.

^bIncludes 52 indicator variables: 20 structural measures, 26 clinical process measures, and 6 patient readmission and mortality rates.