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Study author Dr. Deborah A. Levine and colleagues suspected high blood pressure may play a role in these differences. They examined data from 3,436 people in Birmingham, Ala., Chicago, Minneapolis and Oakland, Calif., who took part in the Coronary Artery Risk Development in Young Adults (CARDIA) study.
37.6 percent of black women, 34.5 percent of black men, 21.4 percent of white men and 12.3 percent of white women.
33.6 percent of Birmingham residents, 27.4 percent in Oakland, Calif., 23.4 percent in Chicago and 19 percent in Minneapolis.