Rates of dementia have steadily fallen over the past 25 years, specifically in the U.S. and Europe, according to a study released Monday in the journal Neurology, “Twenty-seven-year time trends in dementia incidence in Europe and the United States.”

Researchers at Harvard University reviewed data from seven large studies with a total of 49,202 individuals.

They found the incidence rate of dementia has declined by 13%, with decreases more profound in men, but only in Europe and the United States.

Declines were not seen in Asia, South America or Africa.

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