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Researchers analyzed data on more than 274,000 people from six racial and ethnic groups in Northern California who were members of Kaiser Permanente, a large private health care system.
Using records of patient visits, the researchers found that the average annual rate of dementia was 26.6 cases per 1,000 for blacks; 22.2 per 1,000 for American Indians/Alaskan Natives; 19.6 per 1,000 for Hispanics and Pacific Islanders; 19.3 per 1,000 for whites; and 15.2 cases per 1,000 for Asian-Americans.
The researchers calculated that among people who reach age 65 without dementia, 38 percent of blacks, 35 percent of American Indians/Alaskan Natives, 32 percent of Hispanics, 30 percent of whites, 28 percent of Asian-Americans and 25 percent of Pacific Islanders would develop dementia in the next 25 years.
The study was published online Feb. 10 in Alzheimer's & Dementia: The Journal of the Alzheimer's Association./.../