High health care utilization and costs associated with lower socio-economic status: results from a linked dataset.

OBJECTIVE The purpose of this paper was to use a linked dataset to compare health care utilization rates and costs between income groups in Saskatoon, Canada. METHODS The Canadian Community Health Survey was linked to hospital, physician and medication data in Saskatoon. RESULTS Of 3,688 eligible participants, 3,433 agreed to the health survey and data linkage with health records (83.7% overall response). Low-income residents were 27-33% more likely to be hospitalized and 36-45% more likely to receive a medication than middle- and higher-income residents, but were 5-7% less likely to visit a physician over a one-year period. In comparison to middle-income residents, low-income residents had 56% more high users of hospitals, 166% more high users of physicians and 90% more high users of medications. Low-income residents had 34-35% higher health care costs overall than middle- and high-income residents. After multivariate adjustment for increased disease prevalence, low income had a reduced association with high health care utilization. CONCLUSIONS The results demonstrate that residents with lower income are responsible for disproportionate usage of hospitals, physicians and medications; due mainly (but not entirely) to higher disease prevalence.