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This study is aimed at identifying the incidence as well as clinical and socio-demographic correlates of aggression in hospitalized schizophrenic patients. We prospectively recruited participants with Diagnostic and Statistical Manual of Mental Disorders (4th ed., text rev.) diagnosis of schizophrenia presenting to the Clinic for Psychiatry during a 2-year period. We used the Modified Overt Aggression Scale to assess the aggression and Positive and Negative Syndrome Scale (PANSS) to assess the clinical characteristics of participants. One out of three patients with schizophrenia (31%) was aggressive and hostile at the time of presentation. Socio-demographic variables (such as gender, age, duration of illness, and number of hospitalizations) were poor predictors of aggression for schizophrenic patients. The level of aggression was not associated with the clinical characteristics in aggressive and hostile hospitalized schizophrenic patients. However, there was a weak negative association between the level of aggression and the PANSS Negative Scale (p < .01). In conclusion, socio-demographic variables and clinical characteristics seem to be not such good predictors of aggressive behavior in hospitalized schizophrenic patients. Nevertheless, the results of our study contribute to the understanding of the prediction and treatment of aggression in a well-defined cohort of schizophrenic patients. [ABSTRACT FROM AUTHOR]