Objective: Alzheimer disease (AD) is the most frequent cause of dementia. The most common initial symptom of AD is gradually worsening memory decline, but as the dementia develops, patients experience other difficulties in cognitive functioning as well. The aim of this study is to assess the diagnostic validity of Estonian version of Wechsler Adult Intelligence Scale – Third Edition (WAIS-III) on testing the cognitive decline of patients with AD. Method: Participants were 27 patients with AD (mean age: 74.5, mean MMSE: 21.9) and 27 healthy control subjects (mean age: 75.4, mean MMSE: 28.8). All participants were administered the Estonian version of WAIS-III. Differences between groups were compared with Mann-Whitney U test, effect size and sensitivity and specificity indicators. Results: The results between groups were significantly different in 12 of 14 subtests and all of the indexes, which are available in Estonian version of WAIS-III. When applying the Bonferroni correction (p...

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