Table 5. Change in health care utilization and expenditure among noncrossover Medicaid patients in the 6-month periods before and after surgery, by procedure: Michigan, 1981-82.

Measure	Procedure
	Hysterectomy			Oophorectomy and/or salpingectomy			Tonsillectomy			Myringotomy
	Before	After	Percent change	Before	After	Percent change	Before	After	Percent change	Before	After	Percent change
Patient service	Probability
Inpatient hospital	.381	.144	−62.2	.285	.119	−58.2	.104	.064	−38.5	.148	.134	−9.5
Inpatient surgery	.265	.056	−78.9	.161	.038	−76.4	.032	.016	−50.0	1.047	1.054	114.9
Physician	.988	.886	−10.3	.809	.789	−2.5	.985	.830	−15.7	.973	.933	−4.1
Outpatient surgery	.739	.435	−41.1	.625	.454	−27.4	.200	.178	−11.0	.255	.235	−7.8
Prescription drug	.926	.933	0.8	.892	.854	−4.3	.916	.778	−15.1	.906	.792	−12.6
Utilization	Mean per 1,000 patients
Inpatient stays	510	194	−62.0	398	154	−61.3	128	81	−36.7	302	188	−37.7
Inpatient days	2,643	1,587	−40.0	1,628	995	−38.9	543	295	−45.7	2,846	1,000	−64.9
Inpatient surgeries	331	82	−75.2	224	54	−75.9	45	28	−37.8	1114	181	1−28.9
Physician visits	8,001	5,405	−32.4	4,412	3,798	−13.9	6,321	3,165	−49.9	7,899	5,094	−35.5
Outpatient surgeries	1,805	997	−44.8	1,879	907	−51.7	324	282	−13.0	362	289	−20.2
Prescriptions	12,162	12,039	−1.0	7,447	6,107	−18.0	5,588	3,556	−36.4	6,799	5,154	−24.2
Expenditure	Mean per patient
Total2	$1,541	$871	−43.5	$934	$554	−40.7	$420	$246	−41.4	$1,195	$521	−56.4
Inpatient hospital	772	438	−43.3	488	294	−39.8	135	83	−38.5	835	254	−69.6
Physician in hospital	127	56	−55.9	67	33	−50.7	22	11	−50.0	62	26	−58.1
Ambulatory	530	248	−53.2	324	173	−46.6	218	119	−45.4	254	202	−20.5
Prescription drug	96	94	−2.1	54	47	−13.0	36	24	−33.3	43	37	−14.0

¹Result based on less than 20 patients.

²Includes long-term care, not shown.

SOURCE: Health Care Financing Administration, Office of Research and Demonstrations: Data from the Medicaid Tape-to-Tape project.