Cannabis use and childhood trauma interact additively to increase.pdf (519.06 kB)

Cannabis use and childhood trauma interact additively to increase the risk of psychotic symptoms in adolescence.

Download (519.06 kB)
journal contribution
posted on 22.11.2019, 17:11 by Michelle Harley, Ian Kelleher, Mary C. Clarke, Fionnuala Lynch, Louise Arseneault, Dearbhla Connor, Carol B. Fitzpatrick, Mary Cannon

BACKGROUND: Adolescent cannabis use has been shown in many studies to increase the risk of later psychosis. Childhood trauma is associated with both substance misuse and risk for psychosis. In this study our aim was to investigate whether there is a significant interaction between cannabis use and childhood trauma in increasing the risk for experiencing psychotic symptoms during adolescence.

METHOD: Psychiatric interviews using the Schedule for Affective Disorders and Schizophrenia for School-Age Children (K-SADS) semi-structured instrument were carried out with 211 adolescents aged between 12 and 15 years and their parents as part of a population-based study. The interview enquired about early traumatic events, cannabis use and psychiatric symptoms in adolescence.

RESULTS: In separate analyses both cannabis use and childhood trauma were significantly associated with risk of experiencing psychotic symptoms. However, the presence of both childhood trauma and early cannabis use significantly increased the risk for psychotic symptoms beyond the risk posed by either risk factor alone, indicating that there was a greater than additive interaction between childhood trauma and cannabis use.

CONCLUSION: Our finding of a greater than additive interaction between childhood trauma and cannabis use may have implications for the identification of individuals at high risk of experiencing psychotic symptoms. For example, measures to actively discourage or intensively treat cannabis use in children and adolescents who have experienced abuse may help to prevent the development of psychosis in this vulnerable group. Our findings require replication in larger samples to confirm this interaction effect.

History

Comments

The original article is available at http://journals.cambridge.org

Published Citation

Harley M, Kelleher I, Clarke M, Lynch F, Arseneault L, Connor D, Fitzpatrick C, Cannon M. Cannabis use and childhood trauma interact additively to increase the risk of psychotic symptoms in adolescence. Psychological Medicine. 2010;40(10):1627-34

Publication Date

01/10/2010

PubMed ID

19995476

Exports