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August 1988

Sensitivity and Specificity of the Extended Scale for Dementia

Author Affiliations

From the Department of Education and Research, London Psychiatric Hospital, and Department of Psychiatry, University of Western Ontario, London (Mss Lau, Wands, Boniferro, and Carriere, and Drs Merskey and Fox); Robarts Research Institute, London, Ontario (Drs Merskey and Hachinski); and Department of Clinical Neurological Sciences, University Hospital, University of Western Ontario (Dr Hachinski).

Arch Neurol. 1988;45(8):849-852. doi:10.1001/archneur.1988.00520320035012

• The Extended Scale for Dementia was introduced as a test for grading the intellectual function of patients with dementia. Its use in discriminating demented patients from nondemented control subjects has been explored. The test had a sensitivity of 93% and a specificity of 96% in patients over the age of 65 years, but the sensitivity fell to 75% in those younger than 65 years. The scale may be useful, particularly for patients over the age of 65 years, in helping to distinguish dementia from normality.

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