Rxivist logo

Rxivist combines preprints from bioRxiv with data from Twitter to help you find the papers being discussed in your field. Currently indexing 67,221 bioRxiv papers from 295,976 authors.

Objective: The evidence is mixed on whether cannabis use is associated with a particular symptomatology in first episode psychosis (FEP) patients. The authors set out to investigate a) patterns of association between cannabis use and transdiagnostic symptom dimensions; b) whether the extent of use of cannabis contributes to the variation in clinical and subclinical symptom profiles. Method: The authors analysed data from 901 patients and 1235 controls recruited across six countries, as part of the European Network of National Schizophrenia Networks Studying Gene-Environment Interactions (EU-GEI) study. Item response modelling was used to estimate two bifactor models, which included general and specific dimensions of psychotic symptoms in patients and psychotic experiences in controls. The associations between these dimensions and cannabis use was evaluated using linear mixed effects models analyses. Results: In patients, there was a linear relationship between the positive symptom dimension and the extent of lifetime exposure to cannabis, with daily users of high potency cannabis having the highest score (B=0.35; 95%CI 0.14 to 0.56). Moreover, negative symptoms were more common among patients who never used cannabis compared with those with any pattern of use (B=-0.27; 95%CI -0.42 to -0.12). In controls, psychotic experiences were associated with current use of cannabis but not with the extent of lifetime use. Neither patients nor controls presented differences in the depressive dimension related to cannabis use. Conclusions: The extent of use of cannabis explains part of the heterogeneous distribution of positive and negative symptoms of FEP patients.

Download data

  • Downloaded 310 times
  • Download rankings, all-time:
    • Site-wide: 35,251 out of 67,258
    • In neuroscience: 6,144 out of 12,046
  • Year to date:
    • Site-wide: 14,016 out of 67,258
  • Since beginning of last month:
    • Site-wide: 14,682 out of 67,258

Altmetric data


Downloads over time

Distribution of downloads per paper, site-wide


Sign up for the Rxivist weekly newsletter! (Click here for more details.)


News