Table 1.

Fixed effects regression of integration status on MU attestation

	(1)	(2)
	All physicians	Small, independent in 2009
Vertical integration	0.058*** (0.002)	0.117*** (0.004)
Horizontal Integration	0.019*** (0.002)	0.039*** (0.004)
Year (Omitted: 2011)
2012	0.277*** (0.001)	0.223*** (0.002)
2013	0.354*** (0.001)	0.281*** (0.002)
2014	0.332*** (0.001)	0.247*** (0.002)
2015	0.306*** (0.001)	0.208*** (0.002)
2016	0.317*** (0.001)	0.214*** (0.002)
Practice size (Omitted: Solo)
2‐5	0.011*** (0.002)	0.017*** (0.003)
6‐9	0.017*** (0.003)	0.057*** (0.007)
10‐19	0.014*** (0.003)	0.065*** (0.009)
20‐49	0.015*** (0.003)	0.060*** (0.014)
50+	0.006 (0.005)	0.056** (0.028)
Accepts Medicaid	−0.009*** (0.001)	0.002 (0.002)
Constant	0.102*** (0.002)	0.088*** (0.002)
Observations	1 747 404	532 464
R‐squared	0.140	0.091
Number of NPI	291 234	88 744

Robust standard errors in parentheses.

***P < 0.01.

**P < 0.05.