Evidence map›Paper›PMID 20813412›Full record

ArticlePsychiatry research2011

Cannabis users differ from non-users on measures of personality and schizotypy.

Daniel J Fridberg, Jennifer M Vollmer, Brian F O'Donnell, Patrick D Skosnik

Abstract read
In one paragraph

Article in Psychiatry research, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 37 papers.

0numbers the graph read from it
0cells of the map it votes in
37citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

37 citing papers in PubMed.

  1. Article
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  11. Differential Cognitive Performance in Females and Males with Regular Cannabis Use.Journal of the International Neuropsychological Society : JINS · 2021
    Article
  12. Article
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  16. Review
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  20. Observational
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Daniel J FridbergDept. of Psychological and Brain Sciences, Indiana University, Bloomington, IN, USA. dfridber@indiana.edu
Jennifer M Vollmer
Brian F O'Donnell
Patrick D Skosnik

Funding

Neural Oscillations in Schizophrenia and a Rat ModelR21MH091774 · NIMH · TRUSTEES OF INDIANA UNIVERSITY · PI O'DONNELL, BRIAN FRANCIS · 2010 to 2011
$421k
The Effect of Cannabis Use on Human Cerebellar FunctionR21DA023097 · NIDA · TRUSTEES OF INDIANA UNIVERSITY · PI NEWMAN, SHARLENE D · 2007 to 2008
$384k
Sensory Processing Deficits in Cannabis UseR03DA019630 · NIDA · TRUSTEES OF INDIANA UNIVERSITY · PI SKOSNIK, PATRICK DAVID · 2005 to 2006
$150k
NIDA NIH HHS 1 R03 DA019630-01NIDA NIH HHS 1 R21 DA023097-01A1NIDA NIH HHS R03 DA019630NIDA NIH HHS R21 DA023097NIMH NIH HHS R21 MH091774
6 · The paper itself

Abstract

Accumulating evidence indicates that cannabis use may be a risk factor for schizophrenia (SZ), and chronic cannabis users score higher than non-users on measures of schizotypal personality traits. The purpose of the present study was to investigate the relations between normal personality, schizotypy, and cannabis use. Sixty-two chronic cannabis users and 45 cannabis-naïve controls completed a measure of normal personality, the NEO-Five Factor Inventory (NEO-FFI), and two measures of schizotypy, the schizotypal personality questionnaire (SPQ) and perceptual aberration scale (PAS). Substance use was assessed using the SCID I alcohol/drug module and a locally developed drug use questionnaire. On the NEO-FFI, users scored higher than controls on openness, but lower on agreeableness and conscientiousness, and endorsed greater schizotypy on the SPQ and PAS. Higher neuroticism predicted greater schizotypy in both groups, and, higher Extraversion predicted lower negative-syndrome schizotypy among users. Finally, duration of cannabis use was positively correlated with scores on the SPQ and PAS among users, suggesting a relation between overall cannabis use chronicity and schizotypy. These data show that cannabis users differ from non-users on dimensions of normal personality and schizotypy, and provide further evidence that cannabis use is associated with increased levels of psychosis-related personality traits.

Indexed as

PersonalityAdolescentAdultAnalysis of VarianceFemaleHumansMaleMarijuana AbusePerceptual DisordersPersonality InventoryPsychiatric Status Rating ScalesPsychometricsSchizotypal Personality DisorderStatistics as TopicSurveys and QuestionnairesYoung Adult

Identifiers

PMID20813412
PMCPMC3036782

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.