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Nearly one in 10 Americans over 65 has dementia, according to the first nationally representative study of cognitive impairment in more than 20 years.
The study also finds that another 22% have mild cognitive impairment. People with dementia and mild cognitive impairment are more likely to be older, have lower levels of education, and to be Black or Hispanic. Men and women have similar rates of dementia and mild cognitive impairment.
Although dementia and mild cognitive impairment are known to be common in the United States, accurate, up-to-date measures of their national prevalence were scarce.
"Because the HCAP study is part of the nationally representative and long-running Health and Retirement Study, these data not only show the burden of dementia now, but will be used in the future to track the trends in dementia burden in the decades ahead," says study coauthor Kenneth Langa, professor in the University of Michigan Medical School, and a research professor in the Institute for Social Research, and Veterans Affairs Ann Arbor Healthcare System....