Race and place of residence can have a staggering impact on the course and quality of the medical treatment a patient receives, according to new research showing that blacks with diabetes or vascular disease are nearly five times more likely than whites to have a leg amputated and that women in Mississippi are far less likely to have mammograms than those in Maine.

The study, by researchers at Dartmouth, examined Medicare claims for evidence of racial and geographic disparities and found that on a variety of quality indices, blacks typically were less likely to receive recommended care than whites within a given region. But the most striking disparities were found from place to place.

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