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Dr. Finkelstein is with the Family Medicine Centre, Mount Sinai Hospital, Toronto, Ont.; the Department of Family Medicine, McMaster University, Hamilton, Ont.; and the Departments of Family and Community Medicine and Public Health Sciences, University of Toronto, Toronto, Ont.
Correspondence to: Dr. Murray Finkelstein, Family Medicine Centre, Suite 413, Mount Sinai Hospital, Toronto ON M5G 1X5; fax 416 326-7761; murray.finkelstein{at}utoronto.ca
Background: Universal health care systems seek to ensure access to care on the basis of need, rather than income, but there are concerns about preferential access to cardiovascular and specialist care for high income patients. In this study, I used population-based, individual-level health, income and utilization data to determine whether whether there is evidence for differential access to physician care in relation to household income.
Methods: I studied data for 2170 Ontario respondents to the 1995 National Population Health Survey (aged 40 to 79 years) who had approved linkage of their survey responses to the administrative databases of the Ontario Health Insurance Plan and for whom income data were available. I used linear and generalized linear regression to model the mean per capita expenditures on physician care and the probability of referral to a specialist in relation to income and self-reported health status.
Results: Residents of higher income households incurred lower per capita expenditures for physicians' services than those in lower income households; for example, the mean per capita expenditure in the upper middle income group was $220 less (95% confidence interval –$87 to –$334) than the mean per capita expenditure in the lowest income group. Expenditures were significantly related to self-reported health status; for example, the mean per capita expenditure among those reporting fair health status was $590 higher (95% confidence interval $465 to $737) than among those reporting excellent health. After adjustment for health status, there was no association between income and the expenditures on all physician services, out-of-hospital services or specialist care.
Interpretation: Utilization of physicians' services in Ontario is based on need, rather than income.
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