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Non-Right-Handedness and Obstetrical Complications in Paranoid Hallucinatory Schizophrenics

In previous studies a link between pregnancy complications, minor physical anomalies and non-right-handedness was described in schizophrenic patients. There is evidence of an anomaly in the lateralization process in schizophrenia. Many studies of handedness and schizophrenia have found that schizophrenic patients have an increased rate of non-right-handedness compared with normal subjects. The contemporary neurodevelopmental hypothesis of schizophrenia emerged from pathobiological findings. In addition there is evidence for early brain lesions and malformations in fetal brain development. Especially pregnancy and birth complications have been found to be a risk factor for the later development of schizophrenia. In this study we set out to test the possible association between diagnosis and handedness, diagnosis and risk factors, as well as gender and handedness for 60 patients (30 men, 30 women) and 60 controls. The percentage of non-right-handedness was significantly elevated in the patient group (p = 0.0025). In a gender-specific analysis this result could be confirmed only for male patients. Peri- and postnatal developmental risk factors were significantly elevated in schizophrenics compared with controls. The percentage of all risk factors in the male group of schizophrenic non-right-handers was significantly elevated compared with right-handed male schizophrenics.