NEUROLOGY 2004;63:115-121
© 2004 American Academy of Neurology
Mild cognitive impairment, amnestic type
An epidemiologic study
Mary Ganguli, MD MPH,
Hiroko H. Dodge, PhD,
Changyu Shen, PhD and
Steven T. DeKosky, MD
From the Division of Geriatrics and Neuropsychiatry (Dr. Ganguli, C. Shen), Department of Psychiatry, and Department of Neurology and Alzheimers Disease Research Center (Dr. DeKosky), University of Pittsburgh School of Medicine, and Departments of Epidemiology (Drs. Ganguli and Dodge) and Biostatistics (C. Shen), University of Pittsburgh Graduate School of Public Health, PA.
Address correspondence and reprint requests to Dr. M. Ganguli, Western Psychiatric Institute and Clinic, 3811 OHara St., Pittsburgh, PA 15213-2593; e-mail: gangulim{at}upmc.edu
Objective: To estimate the prevalence and examine the course of mild cognitive impairment (MCI), amnestic type, using current criteria, within a representative community sample.
Methods: Retroactive application of MCI criteria to data collected during a prospective epidemiologic study was performed. The subjects were drawn from voter registration lists, composing a cohort of 1,248 individuals with mean age of 74.6 (5.3) years, who were nondemented at entry and who were assessed biennially over 10 years of follow-up. The Petersen amnestic MCI criteria were operationalized as 1) impaired memory: Word List Delayed Recall score of <1 SD below mean; 2) normal mental status: Mini-Mental State Examination score of 25+; 3) normal daily functioning: no instrumental impairments; 4) memory complaint: subjective response to standardized question; 5) not demented: Clinical Dementia Rating Scale score of <1.
Results: At the five assessments, amnestic MCI criteria were met by 2.9 to 4.0% of the cohort. Of 40 persons with MCI at the first assessment, 11 (27%) developed dementia over the next 10 years. Over each 2-year interval, MCI persons showed increased risk of dementing (odds ratio = 3.9, 95% CI = 2.1 to 7.2); 11.1 to 16.7% progressed to Alzheimer disease and 0 to 5.0% progressed to other dementias. Over the same intervals, 11.1 to 21.2% of those with MCI remained MCI; of 33.3 to 55.6% who no longer had MCI, half had reverted to normal.
Conclusions: In this community-based sample, 3 to 4% of nondemented persons met MCI operational criteria; despite increased risk of progressing to dementia, a substantial proportion also remained stable or reverted to normal during follow-up. Amnestic MCI as currently defined is a high-risk but unstable and heterogeneous group.
Received December 15, 2003.
Accepted in final form March 8, 2004.
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