Table 1:

Summary statistics of different samples

	(1) Broad Sample	(2) Patient Mover Sample	(3) PCP Exit Sample
Organizational concentration	0.45 (0.27)	0.44 (0.26)	0.46 (0.25)
Provider concentration	0.38 (0.27)	0.36 (0.25)	0.38 (0.24)
Total utilization ($)	8696 (17,649)	8972 (16,239)	7517 (14,144)
Age	75.94 (7.53)	78.48 (7.46)	78.17 (6.96)
Sex: Female	0.58	0.66	0.62
Race: White	0.87	0.90	0.87
Has Diabetes	0.28	0.27	0.36
Has Hypertension	0.61	0.65	0.76
Has Heart disease	0.32	0.34	0.33
N patient-year obs	48,604,598	214,064	304,954
N patients	9,177,819	25,814	51,570
N assigned PCPs			72,231

Notes: This table reports means and then standard deviations in parentheses. Column 1 describes the Broad Sample. Column 2 describes the sample underlying our mover analysis; this sample restricts to patients who move across regions. Column 3 describes the sample underlying our analysis of PCP exits; this sample restricts to patients whose PCP exits the local market. The number of assigned PCPs in column 3 includes exiting PCPs as well as the PCPs patients switched to.