Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Am J Psychiatry. 2010 Aug;167(8):987-93. doi: 10.1176/appi.ajp.2010.09020189. Epub 2010 May 17.

Cannabis use and the course of schizophrenia: 10-year follow-up after first hospitalization.

Author information

  • 1Department of Psychology, Stony Brook University, Stony Brook, NY 11794-2500, USA. daniel.foti@stonybrook.edu

Abstract

OBJECTIVE:

The authors examined the relationship between cannabis use and the course of illness in schizophrenia over 10 years of follow-up after first psychiatric hospitalization.

METHOD:

The authors assessed 229 patients with a schizophrenia spectrum disorder five times: during the first admission and 6 months, 2 years, 4 years, and 10 years later. Ratings of cannabis use and psychiatric symptoms (psychotic, negative, disorganized, and depressive) were made at each assessment.

RESULTS:

The lifetime rate of cannabis use was 66.2%, and survival analysis revealed that lifetime use was associated with an earlier onset of psychosis. The rates of current use ranged from 10% to 18% across assessments. Cannabis status was moderately stable, with tetrachoric correlation coefficients between waves ranging from 0.48 to 0.78. Mixed-effects logistic regression revealed that changes in cannabis use were associated with changes in psychotic symptoms over time even after gender, age, socioeconomic status, other drug use, antipsychotic medication use, and other symptoms were controlled for. Structural equation modeling indicated that the association with psychotic symptoms was bidirectional.

CONCLUSIONS:

Cannabis use is associated with an adverse course of psychotic symptoms in schizophrenia, and vice versa, even after taking into account other clinical, substance use, and demographic variables.

PMID:
20478874
[PubMed - indexed for MEDLINE]
PMCID:
PMC3594105
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Atypon Icon for PubMed Central
    Loading ...
    Write to the Help Desk