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  • Title: Cannabis--psychosis pathway independent of other types of psychopathology.
    Author: Ferdinand RF, van der Ende J, Bongers I, Selten JP, Huizink A, Verhulst FC.
    Journal: Schizophr Res; 2005 Nov 15; 79(2-3):289-95. PubMed ID: 16125368.
    Abstract:
    AIMS: To investigate if associations between cannabis use and psychotic symptoms occur independently, or occur as a consequence of previous-other types of-psychopathology. METHODS: A 14-year follow-up study of 1580 initially 4- to 16-year-olds who were drawn randomly from the Dutch general population was conducted. At initial assessment, psychopathology was assessed with the Child Behavior Checklist. Across the 14-year follow-up period, cannabis use and psychotic symptoms were assessed with the Composite International Diagnostic Interview (CIDI). Because cannabis use is generally condoned in The Netherlands, false-negative reports of cannabis use may occur less frequently than in countries with stricter drug policies, which supports the value of the present study. RESULTS: Survival analyses indicated that the association between cannabis use and psychotic symptoms occurred independently of initial CBCL scores. CONCLUSIONS: The link between cannabis use and psychotic symptoms is specific, and does not depend on the earlier presence of other types of psychopathology. This indicates that research aimed at unraveling mechanisms that are responsible for this specific association is useful. Further, given the fact that cannabis use seemed to be a specific risk factor for future psychotic symptoms, prevention aimed against cannabis use may prohibit the onset of psychotic symptoms in vulnerable individuals.
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