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Parental violent crime, previous violence and substance abuse predict future violence in people with schizophrenia

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What are the risk factors for violent crime in people with schizophrenia?


13 806 people (8891 men, 4915 women) aged 15 years or older with two or more hospitalisations for schizophrenia (ICD-8, ICD-9 and ICD-10 criteria) between 1 January 1973 and 31 December 2004. Diagnoses of schizophrenia were identified from the Hospital Discharge Register (HDR). After the second hospital discharge, participants were followed until their first conviction for a violent crime, emigration, death or end of follow-up.


Population study, Sweden; recruitment January 1973–December 2004.

Risk factors:

Data on admissions for drug abuse or dependence and alcohol abuse or dependence (ICD-8, ICD-9 and ICD-10 criteria) were collected from the HDR. Data on convictions for violent crime before discharge from hospital were collected from the National Crime Register. Data on people with schizophrenia were merged with the Multi-Generation Register to find information about their parents. The parents were then linked to the HDR to find information on parental alcohol use disorders and the National Crime Register for information on convictions for violent offences. Data on income, marital status, having children and immigration status …

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  • Source of funding Swedish Research Council (medicine).


  • Competing interests None.