Table 3.

ERGM adjusted homophily effects within St. Mary Medical Center and Memorial Hospital.

	St. Mary Medical Center (150034), Gary			Memorial Hospital (150058), South Bend
	Estimate	Std Err	p-value	Estimate	Std Err	p-value
Edges	−23.030	2.088	<0.001	−20.298	0.889	<0.001
Altkstar	3.876	0.351	<0.001	3.286	0.150	<0.001
Cardiology	2.772	1.026	0.007	2.662	0.475	<0.001
Family Practice	−1.834	0.255	<0.001	−1.547	0.096	<0.001
Internal Medicine	−0.398	0.339	0.241	0.208	0.182	0.255
Emergency Medicine	1.702	0.408	<0.001	3.084	0.466	<0.001
Other specialty	−1.004	0.142	<0.001	−1.245	0.129	<0.001

Note. ERGM adjusted coefficients for the network's density (edges), degree distribution (altkstar), and homophily effects by specialty are listed for the two ICD hub hospitals. Specialties included in the “other” category did not achieve an estimable effect when included as an independent specialty. The set of ERGM adjusted homophily by specialty estimates in these models were included in Equation 3 as hospital-level covariates.