Black-white disparities in elderly breast cancer mortality before and after implementation of Medicare benefits for screening mammography.

BACKGROUND: Medicare implemented reimbursement for screening mammography in 1991. MAIN
FINDINGS: Post-implementation, breast cancer mortality declined faster (p< .0001) among White than among Black elderly women (65+ years). No excess breast cancer deaths occurred among Black elderly compared with White elderly through 1990; over 2,459 have occurred since. Contextual socioeconomic status does not explain differences between counties with lowest Black breast cancer mortality/post-implementation declines in disparity and counties with highest Black breast cancer mortality/widened disparity post-implementation.
CONCLUSIONS: The results lead to these hypotheses: (a) Medicare mammography reimbursement was causally associated with declines in elderly mortality and widened elderly Black:White disparity from breast cancer; (b) the latter reflects inherent Black-White differences in risk of breast cancer death; place-specific, unaddressed inequalities in capacity to use Medicare benefits; and/or other factors; (c) previous observations linking poverty with disparities in breast cancer mortality are partly confounded by factors explained by theories of human capability and diffusion of innovation.