Table 4

Comparison of Changes in Quality, HPMG vs Non-HPMG Medical Groups

	HPMG				Non-HPMG

Measure^a	No. of Groups	Baseline^b	Last Year^b	Yearly Change^c	No. of Groups	Baseline^b	Last Year^b	Yearly Change^c	P Value^d
Optimal diabetes care	1	18.1	23.5	+3.1	19	14.6	18.6	+1.8	.42
Optimal CAD care	1	36.8	50.0	+7.4	19	34.3	37.2	+1.2	.12
Composite preventive services	1	69.6	81.3	+4.2	21	72.6	77.1	+1.5	.26
Generic drug use	1	37.4	49.7	+2.9	34	31.7	46.9	+3.4	<.01

CAD = coronary artery disease; HPMG = HealthPartners Medical Group.
↵a Quality measures assessed in 2005 and 2007 (optimal diabetes care and optimal CAD care), 2006 and 2009 (composite preventive services), and 2005 and 2009 (generic drug use).
↵b Unadjusted mean values.
↵c Estimated using a model that adjusted for the following year-specific, patient-level variables: sex, Medicaid status, age, number of primary care visits per year, and number of medications prescribed.
↵d For the difference between slopes.