Population health is a relatively new term, with no agreement about whether it refers to a concept of health or a field of study of health determinants. There is debate, sometimes heated, about whether population health and public health are identical or different. Discussions of population health involve many terms, such as outcomes, disparities, determinants, and risk factors, which may be used imprecisely, particularly across different disciplines, such as medicine, epidemiology, economics, and sociology. Nonetheless, thinking and communicating clearly about population health concepts are essential for public and private policymakers to improve the population's health and reduce disparities. This article defines and discusses many of the terms and concepts characterizing this emerging field.
In March 2004, the editor of The Milbank Quarterly noted a subtle but important change in the journal's subtitle, from "A Journal of Public Health and Health Care Policy" to "A Multidisciplinary Journal of Population Health and Health Policy." In explaining this change, Gray noted,
The term public health has increasingly come to connote a relatively narrow, though vitally important, set of activities that are carried out by agencies with official functions. The Milbank Quarterly is concerned with a very broad range of topics affecting health, as this current issue well illustrates. The term public health has increasingly seemed too confining. … The term population health has been increasingly used in recent years, probably because it suggests a broad set of concerns—a particular perspective—rather than a specific set of activities, actors, or approaches. Thus, population health is more descriptive of the content to which the Quarterly aspires than public health is. (2004, 4)/.../
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