Rate of progression of mild cognitive impairment to dementia – meta‐analysis of 41 robust inception cohort studies
2009/02/19 by A. J. Mitchell, Alex J. Mitchell, M. Shiri‐Feshki · 34 citations
Medicine · Neuroscience · #Dementia and Cognitive Impairment Research #Alzheimer's disease research and treatments #Neurological Disorders and Treatments
paper · pdf · doi:10.1111/j.1600-0447.2008.01326.x
Abstract
OBJECTIVE: To quantify the risk of developing dementia in those with mild cognitive impairment (MCI). METHOD: Meta-analysis of inception cohort studies. RESULTS: Forty-one robust cohort studies were identified. To avoid heterogeneity clinical studies, population studies and clinical trials were analysed separately. Using Mayo defined MCI at baseline and adjusting for sample size, the cumulative proportion who progressed to dementia, to Alzheimer's disease (AD) and to vascular dementia (VaD) was 39.2%, 33.6% and 6.2%, respectively in specialist settings and 21.9%, 28.9% and 5.2%, respectively in population studies. The adjusted annual conversion rate (ACR) from Mayo defined MCI to dementia, AD and VaD was 9.6%, 8.1% and 1.9%, respectively in specialist clinical settings and 4.9%, 6.8% and 1.6% in community studies. Figures from non-Mayo defined MCI and clinical trials are also reported. CONCLUSION: The ACR is approximately 5-10% and most people with MCI will not progress to dementia even after 10 years of follow-up.
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