Violent behaviour in schizophrenia. Retrospective study of four independent samples from Prague, 1949 to 2000
Abstract
Background: A number of studies have reported increased violence in patients with schizophrenia. Aims: To determine the prevalence of violence among those with schizophrenia in samples from 1949,1969,1989 and 2000 in Prague (Czech Republic) and to examine trends in this behaviour.
Method: Records from 404 patients meeting DSM-IV criteria for schizophrenia were screened for violence (defined as 3 points on the Modified Overt Aggression Scale) from the first observed psychotic symptoms until the time of latest available information. Results: Logistic regression revealed a marginally significant increase in violence only in the 2000 cohort.
Overall, violence was associated with schizophrenia in 41.8% of men and 32.7% of women, with no association between substance misuse and violence. Conclusions: The violence rate found in our sample is expected to remain stable over time under stable conditions.
Substance misuse is not the leading cause of violence among those with schizophrenia.