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Kawachi I., Kennedy B. P., Lochner K., Prothrow-Stith D., (1997). Social capital, income inequality, and mortality. American Journal of Public Health 87, 1491–1498.

Objectives

Recent studies have demonstrated that income inequality is related to mortality rates. It was hypothesized, in this study, that income inequality is related to reduction in social cohesion and that disinvestment in social capital is in turn associated with increased mortality.

Methods:

In this cross-sectional ecologic study based on data from 39 states, social capital was measured by weighted responses to two items from the General Social Survey: per capita density of membership in voluntary groups in each state and level of social trust, as gauged by the proportion of residents in each state who believed that people could be trusted. Age-standardized total and cause-specific mortality rates in 1990 were obtained for each state.

Results:

Income inequality was strongly correlated with both per capita group membership (r = -.46) and lack of social trust (r = .76). In turn, both social trust and group membership were associated with total mortality, as well as rates of death from coronary heart disease, malignant neoplasms, and infant mortality.

Conclusions:

These data support the notion that income inequality leads to increased mortality via disinvestment in social capital.

Authors

Kawachi, Ichiro

Professor of Social Epidemiology Chair, Department of Society, Human Development, and Health Department of Society, Human Development, and Health 677 Huntington Avenue Kresge Building 7th Floor Boston, Massachusetts 02115 Phone: 617.432.3915 ikawachi@hsph.harvard.edu...

Kennedy, Bruce P.

Bruce P. Kennedy is a social epidemiologist, formerly at the Harvard School of Public Health.

Lochner, Kimberly

Prothrow-Stith, Deborah

Deborah Prothrow-Stith is Adjunct Professor of the Practice of Public Health at the Department of Health Policy and Management of Harvard University. 841 Parker Street Ground Floor Office Boston, Massachusetts 02120 Phone: 617.495.7777 dprothro@hsph.harvard.edu...

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