PROGNOSIS
Review: long-term annual conversion rate to dementia was 3.3% in elderly people with mild cognitive impairment
| The first 150 words of the full text of this article appear below. |
In elderly people with mild cognitive impairment (MCI), what is the long-term rate of conversion to dementia?
Included studies examined the progression of MCI, defined according to accepted criteria. Outcomes were dementia or probable Alzheimer disease (AD).
Medline, EMBASE/Excerpta Medica, and PsycINFO (to Mar 2008) were searched for cohort studies that had 
5 years of follow-up. 15 studies (n = 2402, mean age 62–82 y) met the selection criteria. Mean follow-up was 6 years (range 5–10 y).
The cumulative conversion rate to dementia was 31% (15 studies) and to AD was 33% (11 studies). The table shows annual conversion rates. Annual conversion rates were lower in studies with longer duration of follow-up.
In elderly people with mild cognitive impairment who were followed up for 
10 years, the annual conversion rate to dementia was 3.3%.
A modified version of this abstract appears in ACP Journal Club in Ann Intern Med and
Queen's University School of Nursing Kingston, Ontario, Canada
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