No race disparities in risk of AIDS and death in HIV patients in Kaiser Permanente system

Surprising trend toward better outcomes for Hispanics

OAKLAND, Calif., July 20, 2009 – Kaiser Permanente researchers found no disparities by race or ethnicity in risk of AIDS and death among HIV-infected patients in a setting of similar access to care. This is despite lower Anti-Retroviral Therapy adherence among Hispanics and African-Americans compared to whites. Researchers also saw a trend toward better outcomes for Hispanics.

The study, which appears online in The Journal of General Internal Medicine, is one of the largest to date to evaluate racial and ethnic differences in clinical outcomes among HIV-infected patients.

Michael J. Silverberg, PhD, MPH, has been a research scientist at the Division of Research (DOR), Kaiser Permanente Northern California since 2004. He received his doctorate in epidemiology from the Johns Hopkins University, Bloomberg School of Public Health in 2001; and his masters in public health in epidemiology from the School of Public Health, University of California, Los Angeles in 1999.

"When it comes to HIV among Kaiser Permanente members, it appears that access to care is the key to eliminating racial and ethnic disparities," said the study's lead author Michael Silverberg, a researcher at the Kaiser Permanente Division of Research. He explained that equal access may likely improve prevention and also encourage early treatment. Kaiser Permanente is the largest private provider of HIV care in the United States. Dr. Silverberg said that certain aspects of Kaiser Permanente care may reduce differences in outcomes among racial/ethnic groups in that most patients have medical insurance coverage and their HIV care is guided by the principles of integrated, chronic condition management and multi-disciplinary HIV specialty care. Another advantage of this setting is Kaiser Permanente's large HIV registry, which has historical data on more than 17,000 patients, including a substantial number of racial/ethnic minorities. This study is among the first to include a large number of Hispanic patients and comprehensively account for other factors -- such as socioeconomic status, HIV disease stage and ART adherence -- that may contribute to racial/ethnic disparities, according to the investigators.

Hispanics had a statistically significant 34 percent survival benefit compared with whites and a 42 percent survival benefit compared with blacks. However, no statistically significant differences for racial/ethnic groups were observed after adjustment for demographics, socioeconomic status and clinical factors.

The study was a retrospective observational cohort study from 1996 to 2005 in Kaiser Permanente, an integrated delivery system with more than 3 million members in Northern California. Researchers studied 3,106 whites, 919 Blacks and 661 Hispanics infected with HIV and looked at differences in ART adherence, new AIDS events and all-cause mortality.

"This observation of reduced mortality in HIV-infected Hispanics is somewhat surprising giving the observed lower adherence rates, reduced immunological responses and lower census-based socioeconomic status compared to whites," said Silverberg. Hispanics had particularly low numbers of cardiovascular and cancer-related deaths. He explained that this phenomenon, also called the Hispanic Paradox, may occur because of differences in diet, genetics and extended family support.

This study is part of Kaiser Permanente's larger ongoing work to end health disparities by providing equitable access and care to its 8.6 million members, by targeting resources to areas in need in communities across the United States, by investing in disparities research, and by implementing strategies that support equity in health nationwide, including universal health coverage. ###

Additional investigators on the study include Wendy Leyden, MPH, Charles P. Quesenberry, Jr., Ph.D., and Michael A. Horberg, MD, MAS, all affiliated with the Kaiser Permanente Division of Research in Oakland, Calif. The research was funded by a Community Benefit grant from Kaiser Permanente Northern California, and a career development award from the National Institute for Allergy and Infectious Diseases, part of the National Institutes of Health.

About the Kaiser Permanente Division of Research (http://www.dor.kaiser.org/)

The Kaiser Permanente Division of Research conducts, publishes, and disseminates epidemiologic and health services research to improve the health and medical care of Kaiser Permanente members and the society at large. It seeks to understand the determinants of illness and well-being and to improve the quality and cost-effectiveness of health care. Currently, DOR's 400-plus staff is working on more than 250 epidemiological and health services research projects.

About Kaiser Permanente

Kaiser Permanente is committed to helping shape the future of health care. We are recognized as one of America's leading health care providers and not-for-profit health plans. Founded in 1945, our mission is to provide high-quality, affordable health care services to improve the health of our members and the communities we serve. We currently serve 8.6 million members in nine states and the District of Columbia. Care for members and patients is focused on their total health and guided by their personal physicians, specialists and team of caregivers.

Our expert and caring medical teams are empowered and supported by industry-leading technology advances and tools for health promotion, disease prevention, state-of-the art care delivery and world-class chronic disease management. Kaiser Permanente is dedicated to care innovations, clinical research, health education and the support of community health. For more information, go: www.kp.org/newscenter.

Contact: Emily Schwartz eschwartz@golinharris.com 415-274-7926 Golin/Harris International