Abstract
Aim: To estimate the prevalence of Alzheimer’s disease (AD)
and other dementias in the USA using a nationally representative sample.
Methods: The Aging, Demographics, and Memory Study sample was composed of 856 individuals
aged 71 years and older from the nationally representative
Health and Retirement Study (HRS) who were evaluated for
dementia using a comprehensive in-home assessment. An expert consensus panel used this information to assign a diagnosis of normal cognition, cognitive impairment but not
demented, or dementia (and dementia subtype). Using sampling weights derived from the HRS, we estimated the national prevalence of dementia, AD and vascular dementia by
age and gender.Results: The prevalence of dementia among
individuals aged 71 and older was 13.9%, comprising about
3.4 million individuals in the USA in 2002. The corresponding
values for AD were 9.7% and 2.4 million individuals. Dementia prevalence increased with age, from 5.0% of those aged
71–79 years to 37.4% of those aged 90 and older. Conclusions: Dementia prevalence estimates from this first nation ally representative population-based study of dementia in
the USA to include subjects from all regions of the country
can provide essential information for effective planning for
the impending healthcare needs of the large and increasing
number of individuals at risk for dementia as our population
ages.
AbstractAim: To estimate the prevalence of Alzheimer’s disease (AD)and other dementias in the USA using a nationally representative sample. Methods: The Aging, Demographics, and Memory Study sample was composed of 856 individualsaged 71 years and older from the nationally representativeHealth and Retirement Study (HRS) who were evaluated fordementia using a comprehensive in-home assessment. An expert consensus panel used this information to assign a diagnosis of normal cognition, cognitive impairment but notdemented, or dementia (and dementia subtype). Using sampling weights derived from the HRS, we estimated the national prevalence of dementia, AD and vascular dementia byage and gender.Results: The prevalence of dementia amongindividuals aged 71 and older was 13.9%, comprising about3.4 million individuals in the USA in 2002. The correspondingvalues for AD were 9.7% and 2.4 million individuals. Dementia prevalence increased with age, from 5.0% of those aged71–79 years to 37.4% of those aged 90 and older. Conclusions: Dementia prevalence estimates from this first nation ally representative population-based study of dementia inthe USA to include subjects from all regions of the countrycan provide essential information for effective planning forthe impending healthcare needs of the large and increasingnumber of individuals at risk for dementia as our populationages.
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