Table 1.

Hospital Referral Region Characteristics (51 HRRs)

Number of:	Mean	Minimum	Maximum
Beneficiaries	138,011	19,424	619,957
Physicians (Total)	1,339	135	8,197
Primary Care	545	68	3,158
Specialist	795	67	5,180
Hospital Networks*	18	2	45
Hospitals Networks+	8	1	36
Community Networks*	7	3	17
Community Networks+	6	2	17

HRRs are as defined by the Dartmouth Atlas of Health Care

^*Hospitals and Communities with 5 or more PCPs included

⁺Hospitals and Communities with at least 3,000 assigned patients