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Processing Speed Mediates Gender Differences in Memory in Schizophrenia

The primary aim of this study was to examine whether processing speed mediates the association between gender and episodic memory in schizophrenia. Participants were 51 female and 51 male outpatients comparable on demographic, clinical, and cognitive variables. Memory tests included both verbal and visual measures. Both groups scored below the normative mean of the memory and processing speed tests, except that females performed slightly above the mean on face recognition. Females outperformed males on verbal memory, visual recognition, and processing speed. Mediation regression analyses showed processing speed mediated immediate and delayed recall for both verbal and visual memory measures. Thus processing speed appears to be a critical variable for understanding cognitive deficits in schizophrenia and may be an important target for cognitive rehabilitation.