Table 2.

Measures of Patient Loyalty to Assigned Hospital

	Large > 5,000 Admits*	Medium 5,000 < Admits > 750*	Small < 750 Admits*
Loyalty to primary hospital
Percent of medical admissions at primary hospital	67 (59, 75)	69 (60, 79)	66 (58, 78)
Percent of surgical admissions at primary hospital	64 (56, 73)	49 (39, 60)	31 (19, 42)
Percent of MD E&M claims from affiliated staff of primary hospital	71 (64, 78)	67 (60, 74)	57 (50, 66)

Loyalty is defined as the percent of all admissions or claims provided at the hospital to which the patient was assigned or the percent of E&M claims provided by its extended medical staff. Analysis restricted to hospitals with at least three admissions or 10 people assigned. Mean and 25th and 75th percentile unless otherwise specified.

^*Hospital size defined by the annual number of Medicare admissions.