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A relationship has been found between cognition and functioning in patients with schizophrenia. Our objective was to study the relationship between the cognitive domains assessed by the MATRICS Consensus Cognitive Battery (MCCB), and functioning as evaluated using the functioning subscale of the Global Assessment of Functioning scale (GAF-f). Methods: A sample of 83 clinically stable outpatients diagnosed with schizophrenia according to DSM-IV criteria were assessed using the MCCB and the GAF-f. Pearson correlations and stepwise linear regression analyses were performed. Results: Correlation analysis between the GAF-f and the cognitive domains of the MCCB showed a significant relationship between functioning and all of the cognitive domains. Regression yielded a statistically significant model (F2,74 = 20.4, p < 0.001) in which functioning was related to Speed of processing (standardized β = 0.369, p = 0.001) and to Social cognition (standardized β = 0.325, p = 0.003). Together, these two variables explained 33.8% of the variance of functioning. Conclusions: Both speed of processing and social cognition have an important association with functioning in patients with schizophrenia.
