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  • Title: Relationship of birth season to clinical features, family history, and obstetric complication in schizophrenia.
    Author: Dassa D, Sham PC, van Os J, Abel K, Jones P, Murray RM.
    Journal: Psychiatry Res; 1996 Aug 30; 64(1):11-7. PubMed ID: 8888360.
    Abstract:
    Birth in late winter and spring has been consistently shown to be a risk factor of schizophrenia. The relationship of late winter/spring birth to clinical characteristics and other putative risk factors, such as family history and obstetric complications, may provide clues to etiology. Data relating to season of birth, clinical features, family history, and obstetric complications were analyzed for 192 patients with schizophrenia as defined by Research Diagnostic Criteria (including schizoaffective disorder). There was no significant association of season of birth with any of the psychopathological dimensions nor was there a significant association with obstetric variables or family history. However, winter-born schizophrenic patients who had a negative family history were more likely to have a history of obstetric complications. These findings suggest that obstetric complications associated with schizophrenia are perhaps the result of some seasonal risk factors important in those without a family history of the disorder.
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