[Sexual offending in schizophrenia - a comparative trial].

Studies suggest a complex relationship between schizophrenia and sexually offensive behaviour. The mental disorder itself, antisocial personality traits, drug abuse and adverse childhood experiences are suggested to have an impact on sexual offending in mentally disordered offenders. Similarities in psychosexual variables for schizophrenic and sexual offenders in general are found. This study aimed to preserve first findings of sex offence features and behaviours exhibited by psychotic men in Germany. Furthermore a typology of the schizophrenic offenders was developed. Records of 64-male restricted hospital order in-patients (32 patients with and 32 patients without an ICD-10 psychotic disorder) examined at the Institute for Forensic Psychiatry or resident in the Department of Psychiatry and Psychotherapy of the prisons in Berlin from 1980 - 2006 with an index conviction for a contact sex offence against a woman provided the material for research. A comparative trial design was used to differentiate the psychotic and non psychotic offender group. A check list which based on the method of a content analysis containing items related to the offender and the index offence was developed and applied to the records of men. A similar extent of social isolation, psychosexual variables and adverse childhood experiences are found for schizophrenic and non schizophrenic offenders. Negative symptoms of schizophrenia as well as antisocial traits had a great impact on schizophrenic sexual offending. Solely the occurrence of bizarre behaviour was influenced by positive symptoms. Different offence characteristics appeared in the four outlined schizophrenic subgroups such as bizarre behaviour of the psychotic, assaultive behaviour of the dissocial, chaotic behaviour of the substance abusive and negative childhood experiences of the sadistic schizophrenic offenders. The partly controversial findings underline the need for further studies to understand sexual offending in the heterogeneous group of schizophrenic men.