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Higher Risk of Dementia Seen in Those Hailing From 'Stroke Belt'

Study found odds for cognitive decline higher for those born in certain southeastern U.S. states

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TUESDAY, Aug. 1, 2017 (HealthDay News) -- Health issues for people born in high stroke mortality states (HSMSs) include a higher risk of developing dementia -- even if they move elsewhere, according to research published online July 31 in JAMA Neurology.

Paola Gilsanz, Sc.D., of the Kaiser Permanente Northern California Division of Research in Oakland, and the University of California, San Francisco, and colleagues evaluated data for 7,423 adults living in northern California. Information was obtained when they were in their 40s and up to 20 years later. Dementia was identified in 2,254 of the participants (30.4 percent), according to the report.

At age 65, the absolute 20-year risk for dementia among California residents born in HSMSs was 30.13 percent, compared with 21.80 percent among Californians not born in those states, the researchers found. Dementia risk was roughly 26 percent higher for those born in nine states, nearly all in the Southeast. Blacks, in particular, were at an increased risk for dementia if born in a HSMS.

"To our knowledge, this is the first study to date of place of birth and incident dementia and shows increased risk for individuals born in a HSMS, even though all participants subsequently resided in California," the authors write. "Birth in a HSMS was common among black participants. Place of birth has enduring consequences for dementia risk and may be a major contributor to racial disparities in dementia."

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