Background In the United States, geographic variation in hospitaluse is common. It is uncertain whether there are similar geographicvariations in the health care system of the Department of VeteransAffairs (VA), which differs from the private sector becauseit predominantly serves men with annual incomes below $20,000,has a central system of administration, and uses salaried physicians.Thus, it might be less likely to have geographic variations.
Methods We used VA data bases to obtain information on patientstreated for eight diseases (chronic obstructive pulmonary disease,pneumonia, congestive heart failure, angina, diabetes, chronicrenal failure, bipolar disorder, and major depression). We analyzedtheir use of hospital and outpatient services by assessing therisk-adjusted numbers of hospital days (the average number ofdays a patient spent in the hospital per 12 months of follow-up,regardless of the number of hospital stays), hospital-dischargerates, and clinic-visit rates from 1991 through 1995 for theentire system and within the 22 geographically based healthcare networks.
Results We found substantial geographic variation in hospitaluse for all eight cohorts of patients and all the years studied.Variations in the numbers of hospital days per person-year amongthe networks were greatest among patients with chronic obstructivepulmonary disease (ranging from a factor of 2.7 to a factorof 3.1) during a given year and smallest among patients withangina (ranging from a factor of 1.5 to a factor of 2.1). Levelsof hospital use were highest in the Northeast and lowest inthe West. The variation in the rates of clinic visits for principalmedical care among the networks ranged from a factor of approximately1.6 to a factor of 4.0; variations in the rates were greatestamong patients with chronic renal failure and smallest amongpatients with congestive heart failure. There was no clear geographicpattern in the rates of outpatient-clinic use.
Conclusions There are significant geographic variations in theuse of hospital and outpatient services in the VA health caresystem. Because VA physicians are unable to increase their incomeby changing their patterns of practice, our findings suggestthat their practice styles are similar to those of other physiciansin their geographic regions.
Source Information
From the Center for Quality of Care and Utilization Studies, Veterans Affairs Medical Center, Houston (C.M.A., N.J.P., J.S., T.J.M., H.-J.Y., K.P., M.L.E., N.P.W.); and the Veterans Health Administration, Department of Veterans Affairs, Washington, D.C. (G.B., K.W.K.).
Address reprint requests to Dr. Ashton at the VA Medical Center (152), 2002 Holcombe Blvd., Houston, TX 77030, or at cashton{at}bcm.tmc.edu.
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