| Objective: To study the psychosocial factors associated with violent behavior in schizophrenic patients and violent criminals. Methods: A controlled study was conducted between 49 violent criminals and 35 schizophrenic patients with violent behavior. They were assessed using demographic information questionnaire,past history questionnaire,Minnesota Multiphasic Personality Inventory(MMPI),Personality Diagnostic Questionnaireï¼4th Version(PDQ4+),Early deviant family environment questionnaire (before 18 years old) and Family Environment Scale-Chinese version(FESï¼CV). Results: (1) There are more instances with history of aggressive behavior and parental psychotic history in schizophrenic patients than in violent criminals. There are more instances with history of alcohol abuse,parental unsound rearing styles, suffering parental abuse and family defect in early years in violent criminals than in schizophrenic patients . (2) Schizophrenic patients have higher F, D, Hs, Hy, Pa scores of MMPI than violent criminals. (3) Significant differences between two groups are found in cohesion, achievement,entertainment,organization subscales of the Family Environment Scale. (4) Compared with violent criminals ,Schizophrenic patients have higher scores in paranoid,schizoid,schizotypal,hysteric,dependent, passive aggressive and depressive personality disorder and have lower scores in antisocial personality disorder of PDQ4+. (5) Logistic regression analyses suggests that the main risk factors for violent behavior of schizophrenic patients are the history of aggressive behavior,the F,Pa scores of MMPI and parental psychotic history,while the risk factors for violent behavior of criminals are the suffering parental abuse in early years,parental unsound rearing styles,antisocial personality disorder and the history of alcohol abuse. Conclusion: There are significant differences between two groups in psychosocial factors,but each group has some similar personality deviation.
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