Early onset of cannabis use and violent behavior in psychosis.
- Moulin V Department of Psychiatry, Unit for Research in Legal Psychiatry and Psychology, Institute of Forensic Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Alameda L Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.
- Framorando D Department of Psychiatry, Unit for Research in Legal Psychiatry and Psychology, Institute of Forensic Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Baumann PS Department of Psychiatry, Service of General Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Gholam M Department of Psychiatry, Center for Psychiatric Epidemiology and Psychopathology, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Gasser J Department of Psychiatry, Unit for Research in Legal Psychiatry and Psychology, Institute of Forensic Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Do Cuenod KQ Department of Psychiatry, Unit for Research in Schizophrenia, Center for Psychiatric Neuroscience, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- Conus P Department of Psychiatry, Service of General Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
- 2020-07-17
Published in:
- European psychiatry : the journal of the Association of European Psychiatrists. - 2020
English
BACKGROUND
Although evidence from psychosis patients demonstrates the adverse effects of cannabis use (CU) at a young age and that the rate of CU is high in subgroups of young violent patients with psychotic disorders, little is known about the possible effect of the age of onset of CU on later violent behaviors (VB). So, we aimed to explore the impact of age at onset of CU on the risk of displaying VB in a cohort of early psychosis patients.
METHOD
Data were collected prospectively over a 36-month period in the context of an early psychosis cohort study. A total of 265 patients, aged 18-35 years, were included in the study. Logistic regression was performed to assess the link between age of onset of substance use and VB.
RESULTS
Among the 265 patients, 72 had displayed VB and 193 had not. While violent patients began using cannabis on average at age 15.29 (0.45), nonviolent patients had started on average at age 16.97 (0.35) (p = 0.004). Early-onset CU (up to age 15) was a risk factor for VB (odds ratio = 4.47, confidence interval [CI]: 1.13-20.06) when the model was adjusted for age group, other types of substance use, being a user or a nonuser and various violence risk factors and covariates. History of violence and early CU (until 15) were the two main risk factors for VB.
CONCLUSIONS
Our results suggest that early-onset CU may play a role in the emergence of VB in early psychosis.
Although evidence from psychosis patients demonstrates the adverse effects of cannabis use (CU) at a young age and that the rate of CU is high in subgroups of young violent patients with psychotic disorders, little is known about the possible effect of the age of onset of CU on later violent behaviors (VB). So, we aimed to explore the impact of age at onset of CU on the risk of displaying VB in a cohort of early psychosis patients.
METHOD
Data were collected prospectively over a 36-month period in the context of an early psychosis cohort study. A total of 265 patients, aged 18-35 years, were included in the study. Logistic regression was performed to assess the link between age of onset of substance use and VB.
RESULTS
Among the 265 patients, 72 had displayed VB and 193 had not. While violent patients began using cannabis on average at age 15.29 (0.45), nonviolent patients had started on average at age 16.97 (0.35) (p = 0.004). Early-onset CU (up to age 15) was a risk factor for VB (odds ratio = 4.47, confidence interval [CI]: 1.13-20.06) when the model was adjusted for age group, other types of substance use, being a user or a nonuser and various violence risk factors and covariates. History of violence and early CU (until 15) were the two main risk factors for VB.
CONCLUSIONS
Our results suggest that early-onset CU may play a role in the emergence of VB in early psychosis.
- Language
-
- English
- Open access status
- gold
- Identifiers
-
- DOI 10.1192/j.eurpsy.2020.71
- PMID 32669157
- Persistent URL
- https://sonar.ch/global/documents/278103
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