EXHIBIT 3.

Variation In Key Measures Of Interest By Region, Academic Medical Center Status, Urbanicity, And Size Of Accountable Care Organization (ACO)

		Percent of those visiting during performance year attributed		Percent of those visiting a PCP during performance year attributed		Percent of visits occurring within ACO
	Number	Prospective	Performance year	Prospective	Performance year	Prospective	Performance year
OVERALL
Mean	— a	44.7	56.6	62.4	85.6	68.4	74.2
25th percentile	— a	36.5	48.5	55.7	82.2	57.1	65.0
75th percentile	— a	53.6	65.0	70.9	90.3	82.4	85.7
REGION
Midwest	399	45.6	57.2	64.6	86.2	70.4	75.5
Northeast	331	45.1	56.1	63.3	85.4	66.4	71.5
South	638	43.8	55.4	62.0	85.5	67.6	73.6
West	274	45.0	59.5	58.8	85.3	69.8	77.2
ACADEMIC MEDICAL CENTER
Yes	686	40.8	52.7	59.1	83.5	63.4	69.7
No	956	47.6	59.5	64.7	87.1	72.1	77.5
URBANICITY
Rural	259	54.6	66.4	70.0	89.5	81.0	84.9
Urban	1,383	42.9	54.8	60.9	84.9	66.1	72.2
SIZE OF ACO (no. of BENEFICIARIES)
<10,000	877	45.1	57.2	62.6	85.7	68.9	74.8
10,000–15,000	412	44.0	55.6	62.1	85.4	68.0	73.5
>15,000	353	44.7	56.3	62.2	85.6	67.8	73.6

SOURCE Authors’ analysis of 100 percent Medicare fee-for-service claims data, 2008–09. NOTES N= 1,642. PCP is primary care physician.

^aNot applicable.