The Effect of Primary Care Physician Supply and Income Inequality on Mortality Among Blacks and Whites in US Metropolitan Areas

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Abstract
Objectives. This study assessed whether income inequality and primary care physician supply have a different effect on mortality among Blacks compared with Whites. Methods. We conducted a multivariate ecologic analysis of 1990 data from 273 US metropolitan areas. Results. Both income inequality and primary care physician supply were significantly associated with White mortality (P < .01). After the inclusion of the socioeconomic status covariates, the effect of income inequality on Black mortality remained significant (P < .01), but the effect of primary care physician supply was no longer significant (P > .10), particularly in areas with high income inequality. Conclusions. Improvement in population health requires addressing socioeconomic determinants of health, including income inequality and primary care availability and access.

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