Eric Larson and Kenneth Langa discuss whether the risk of dementia is increasing or decreasing over time.
In 2005, a study based on data from 17 years of United States National Long-Term Care Surveys reported a 42% decline in prevalence of severe cognitive impairment from 1982 to 1999. We subsequently summarized the results of this and four other studies reporting declines in prevalence or incidence of dementia in the US, England, Stockholm, and Rotterdam