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The effects of immune status and race on health service use among people with HIV disease.

J D Piette, V Mor, K Mayer, S Zierler and T Wachtel

Brown University's AIDS Program, Providence, RI.

OBJECTIVES. The purpose of this study was to examine the relationship between CD4 lymphocyte count and health service use, and to determine whether differences in the rates of service use between Whites and people of color could be identified. METHODS. Medical records for 571 HIV-infected individuals were analyzed. Incidence rates and relative rates across CD4 strata (defined by cell counts) were calculated for inpatient and outpatient events. Rate ratios comparing people of color with Whites were estimated within strata, adjusting for confounding factors using a Mantel-Haenszel pooling procedure. RESULTS. Both inpatient and outpatient service use increased over progressively lower levels of CD4 counts. Within each CD4 stratum and controlling for other factors, White participants had more HIV clinic visits and fewer admissions than people of color. Among participants with fewer than 51 CD4 cells per cubic millimeter, people of color were admitted 20% more often, had 35% more inpatient days per person-year, and had only 74% as many HIV clinic visits as their White counterparts. CONCLUSIONS. These results indicate that CD4 lymphocyte count is strongly associated with increased usage of health services. People of color with HIV disease are more likely than similar Whites to be admitted to the hospital and less likely to use outpatient care.

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