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DHMC Development

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The important thing is to never stop questioning.
— Albert Einstein

Helping put outcomes on the map

By Barbra Alan

Politician, writer, World War II veteran, industrialist, activist: Throughout his life, General Robert Wood Johnson was all of these and more. During his 30-plus years at the helm of Johnson & Johnson, he helped build the small, family-owned business his father had started into the world's largest health- and medical- products manufacturer.

But Johnson's contributions to health care and medicine extend far beyond the business world. His lifetime devoted to public service and philanthropy culminated in the establishment in 1968 of the Robert Wood Johnson Foundation. Started with an endowment of $1.2 billion bequeathed by General Johnson, the Foundation's assets have grown to $8.4 billion, making it the nation's fourth-largest foundation and largest philanthropy devoted exclusively to health and health care.

Over the years, the Robert Wood Johnson Foundation has been an invaluable partner with Dartmouth Medical School by supporting numerous research projects. Among them is The Dartmouth Atlas of Health Care, a groundbreaking research project of the Center for the Evaluative Clinical Sciences (CECS). The Atlas has been funded by the Foundation for over a decade.

The Dartmouth Atlas of Health Care is produced by a group of epidemiologists, economists, and statisticians headed by pioneering epidemiologist John Wennberg, M.D., M.P.H., the Peggy Y. Thomson Professor of the Evaluative Clinical Sciences and the founder and director DEVELOPMENT artmouth-Hitchcock Medical Center of CECS. The project illustrates—literally—how medical resources are distributed and used throughout the United States. With its first printing in 1996, the Atlas spotlighted striking variations in how Americans use health-care resources and what influence the local supply of resources (such as hospital beds) has on the rates at which those resources are used. It showed that geography is destiny: the care you receive is often determined by where you live and the doctor you consult, rather than by the best treatment for you and what you actually want.


Jack Wennberg, above left, and Megan McAndrew, above right, are among those who work on the Dartmouth Atlas—which often makes the news.

"It's not about pointing fingers or placing blame," insists Megan McAnMcAndrew, M.B.A., M.S., communications director for CECS and editor of the Atlas. Rather, the project raises important questions about how healthcare services are used throughout the country and why this use may vary among communities, with the goal of reducing unnecessary spending and improving quality.

As its name implies, The Dartmouth Atlas of Health Care is filled with maps. They divide the United States into 3,000-some hospital service areas, then into more than 300 hospital referral regions (groups of hospital service areas that are natural markets for tertiary care, such as open-heart surgery or neurosurgery) to show where people go for acute and specialized services. On these maps, state boundaries tend to blur. For example, the Lebanon, N.H., referral region includes all of eastern Vermont, from Brattleboro north to Newport. The New Haven, Conn., region includes parts of eastern New York and part of Long Island.

Each region is color-coded to make it clear which areas have the highest rates of, say, back surgery or coronary angiography or the highest per capita supply of hospital beds. The Atlas is based on the Medicare population, since

Medicare claims, which account for 35% of total health-care spending, are contained in the only uniform, national claims database. "Every state has a different requirement for how claims are reported, so you can't get comparable claims databases from state to state," explains McAndrew.

Two decades of research led up to the Atlas. In the early 1970s, fueled by an interest in the regional distribution of health-care resources, Jack Wennberg collaborated with Dr. Alan Gittelsohn, his former teacher from Johns Hopkins, to develop a method for monitoring health-care systems. Their method, called smallarea analysis, uncovered large variations in health-care usage among different areas, even when factors such as disease severity, age, gender, and so on were controlled. For example, their early work revealed that children in certain areas of Vermont routinely had their tonsils removed, while children in other areas of the state did not. "These findings challenged some basic assumptions about how health-care decisions were made," McAndrew says. "It wasn't something that doctors had an easy time accepting, and it didn't make Jack a popular guy."

The discovery that surgical rates varied in large part because of differences in medical opinion led Wennberg to document the outcomes of common medical practices—outcomes research. He and his colleagues demonstrated that decision- making about many procedures, such as hysterectomy and prostatectomy, were made in the absence of information about both outcomes and patients' preferences.

In the early 1990s, Wennberg's team at CECS began to work with the national Medicare claims database, using the methodology developed in Vermont to determine local patterns of care throughout the United States. Once this analysis was complete, one area could be compared to any other area—giving a national picture of the distribution and utilization of health-care resources. An atlas, complete with maps, charts, and text, seemed the perfect vehicle for presenting these findings.

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