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The prevalence of dementia was 29.8 percent(147 subjects).The condition was mild in 8.3 percent,moderate in 10.3 percent,and severe in 11.1 percent.There were no significant sex-related differences in prevalence or severity.Of the subjects with dementia,43.5 percent had Alzheimer's disease,46.9 percent had vascular dementia(multi-infarct dementia in 34.6 percent,dementia related to cerebral hypoperfusion in 4.1 percent,and mixed dementia in 8.2 percent),and 9.5 percent had dementia due to other causes.The three-year mortality rate was 23.1 percent in the subjects without dementia,42.2 percent in the patients with Alzheimer's disease,and 66.7 percent in the patients with vascular dementia.Infarcts detected by CT scanning were significantly more common in the subjects with dementia than in those without it(27.9 percent vs.12.6 percent).Conclusions. Dementia was present in nearly a third of unselected 85-year-olds in Sweden.Almost half these subjects appeared to have vascular dementia,which may currently be more amenable to prevention or treatment than Alzheimer's disease. |
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