Table 1

Practices’ Organizational Characteristics and External Incentives, Time 1 and Time 2 (N = 566)

	Practices, %

Variable	T1 (2007–2010)	T2 (2012–2013)	P Value
Organizational characteristic
Ownership^a			<.001
Physician owned	90.6	86.8
Hospital owned	9.4	13.3
Size^a			<.001
1–2 physicians	65.7	63.6
3–8 physicians	34.3	36.4
External incentive
Pay for performance^a			<.001
No	47.5	41.0
Yes	52.5	59.0
Public reporting^a			<.001
No	59.2	45.4
Yes	40.8	54.6
Percentage of revenue from Medicare^b			<.001
≤20%	28.4	24.7
21% to 35%	26.6	28.4
>35%	44.9	46.9

T1 = time 1; T2 = time 2.
↵a The McNemar test was used to test for significant differences over time.
↵b The Rao-Scott χ² test was used to test for a significant difference over time.
Note: Analyses were weighted to be nationally representative.