Exact estimates of the prevalence of dementia depend on the definition and specific threshold used, but it is clear that the prevalence increases dramatically with age. The syndrome affects approximately 5%-8% of individuals over age 65, 15%-20% of individuals over age 75, and 25%-50% of individuals over age 85. Alzheimer disease is the most common dementia, accounting for 50%-75% of the total, with a greater proportion in the higher age ranges. Vascular dementia is probably next most common, but its prevalence is unknown. The remaining types of dementia account for a much smaller fraction of the total.[i]
Figure 1 compares
the absolute level of Alzheimer disease burden (measured by DALYs as
"Alzheimer`s and other dementias" ) between the EU25, EU15, EU 10 and
the world (including the EU25) for different age groups. Although the
differences in absolute values are to be expected, females in all regions carry
the higher burden of Alzheimer, in large part because of their longer life
expectancy. This gender divergence between males and females begins in terms of
burden of disease begins between the ages of 60-69.
[i] http://www.psych.org/psych_pract/treatg/pg/pg_dementia_2.cfm#d.
American Psychiatric Association. Practice Guidelines for the Treatment of
Patients with Alzheimer’s Disease and Other Dementias of Late Life-Prevalence
and course. Last accessed April 1, 2004.
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