Table 3.

Descriptive Statistics and Correlation Matrix of Study Variables (n = 11 264).

	Mean	SD	1	2	3	4	5	6	7	8	9	10	11	12	13
1. Differentiated services	6.58	6.87	1.00
2. Geographic distance in miles (log)	2.29	.97	−.03	1.00
3. Power asymmetry (log)	.01	1.21	.68	−.01	1.00
4. Nonprofit/public ownership	.75	.43	.20	−.07	.20	1.00
5. Multihospital system membership	.76	.42	−.01	−.03	.06	−.06	1.00
6. Bed size (log)	5.39	.88	.50	−.13	.67	.35	.09	1.00
7. Case mix index	1.62	.26	.40	−.16	.20	−.04	−.02	.24	1.00
8. Teaching hospital	.39	.49	.36	−.24	.31	.26	.04	.50	.28	1.00
9. Market competition	.86	.14	.02	.33	−.01	−.08	−.01	.09	.08	−.02	1.00
10. Population density (log)	.58	1.12	.05	−.04	.00	.05	.00	.19	.07	.21	.55	1.00
11. Community wealth (log)	3.86	.19	.03	−.02	.01	.06	−.03	.08	.05	.11	.21	.44	1.00
12. Specialist density (log)	.96	.43	.08	−.21	.01	.17	.01	.23	.09	.32	.14	.50	.58	1.00
13. Medicare beneficiary density (log)	5.23	.21	−.01	−.07	−.01	.20	.02	.10	−.14	.00	−.29	−.29	−.16	.07	1.00