Objective: To compare the intellectual efficiency of people with schizophrenia to healthy subjects, and within schizophrenics compare patients with predominantly negative symptoms and those with positive symptoms. Methods: A case-control study was conducted between September 2013 and September 2014 and enrolled 56 participants (28 schizophrenic patients and 28 controls). The Cattell Culture Fair II Intelligence test (Cattell 2) was used to measure intellectual functioning whereas PANSS (Positive and Negative Syndrome Scale) scale was used to assess symptom severity.

Results: The control group was significantly associated with higher level of IQ test. A negative correlation was found in schizophrenic patients between the negative symptoms and IQ test (r = - 0.710, p < 0.001). However, no association was found between the positive symptoms and the IQ test (r = 0.229, p = 0.241).

Conclusion: This study is the first to evaluate the effect of schizophrenia on cognition and attainment. The psychopathological approach and the new therapeutic and psychosocial strategies led clinicians to reevaluate their therapeutic objectives based essentially on the evaluation of cognitive abilities in order to improve the prognosis of schizophrenia. Clinicians will improve their therapeutic management of schizophrenic subjects by applying new scientific advances in the cognitive domain in their clinical practice.

Keywords: schizophrenia; schizoaffective; intellectual efficiency; psychotic symptoms; cognitive psychology; clinical psychology

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