. 1988 Fall;10(1):37–49.

Table 6. Mean hospital admissions per 1,000 person-years, days per person-year, and days per admission for Fallon and Marshfield Medicare enrollees and fee-for-service beneficiaries, by enrollment period: 1980-82.

Enrollment period	Fallon			Marshfield

	Enrollee	Fee-for-service¹	Ratio	Enrollee	Fee-for-service¹	Ratio
	Admissions per 1,000 person-years
Total postenrollment²	^*276	486	0.57	393	388	1.01
1 year preenrollment	^*195	307	0.64	^*200	230	0.87
1 year postenrollment	^*267	431	0.62	355	331	1.07
2 year postenrollment	^*228	397	0.57	337	339	0.99
	Days per person-year
Total postenrollment²	^*2.5	5.8	0.43	^*3.6	4.0	0.90
1 year preenrollment	^*1.9	3.5	0.54	^*1.7	2.5	0.68
1 year postenrollment	^*2.4	5.0	0.47	3.2	3.5	0.97
2 year postenrollment	^*1.9	4.5	0.42	3.0	3.3	0.91
	Days per admission
Total postenrollment²	^*8.1	11.0	0.74	^*8.7	10.0	0.87
1 year preenrollment	^*9.7	11.4	0.87	^*8.7	10.8	0.81
1 year postenrollment	^*8.2	11.2	0.73	^*9.0	10.3	0.87
2 year postenrollment	^*8.0	11.2	0.71	^*8.7	9.6	0.91

Significantly different from fee-for-service rates at the .05 level.

Weighted to reflect the age, sex, and geographic distribution (the health maintenance organization penetration rate by county) of the enrollee population.

Maximum postenrollment period was 33 months at Fallon and 27 months at Marshfield.

SOURCE: For fee-for-service beneficiaries and health maintenance organization (HMO) enrollees' preenrollment: Health Care Financing Administration, Bureau of Data Management and Strategy: Data from the Medicare Statistical System; for HMO enrollees' postenrollment: Data reported by the HMO's.