Co-Occurrence of Affective and Cognitive Symptoms: The Epidemiological Evidence

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Abstract
Affective and cognitive symptoms co-occur considerably above chance in clinical (i.e. treated) samples. By contrast, in population-based surveys, the syndromes of depression and dementia do not occur at the case level more than by chance, but symptoms of each may correlate significantly though never strongly. Epidemiological data from prospective longitudinal studies are now sought, focussed on cases showing both groups of symptoms.

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