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It is unclear whether cognitive impairment is prevalent in the remitted state of unipolar disorder.

To evaluate whether cognitive function is impaired in the remitted state in patients with unipolar depression compared with healthy control individuals, and to investigate the association to prior course of illness, i.e. the number, duration and severity of prior depressive episodes.

Systematic search on existing on-line databases and hand-search of original published papers.

A total of 11 studies fulfilled the selection criteria and were included in the review, including a total of 500 patients remitted from unipolar depression and 471 healthy control individuals. In nine of the eleven studies performance on neuropsychological tests was found to be decreased in patients compared to healthy control individuals in at least one of the tests. Methodological drawbacks were prevalent including …