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Related Experiment Videos

The Cannabis Problems Questionnaire: factor structure, reliability, and validity.

Jan Copeland1, Stuart Gilmour, Peter Gates

  • 1National Drug and Alcohol Research Centre, University of New South Wales, Sydney, NSW 2052, Australia. J.Copeland@unsw.edu.au

Drug and Alcohol Dependence
|May 27, 2005
PubMed
Summary
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The Cannabis Problems Questionnaire (CPQ) is a new 22-item tool that reliably measures cannabis-related problems in adults. It is a valid and sensitive instrument for both clinical and research settings.

Area of Science:

  • Psychiatry
  • Addiction Medicine
  • Psychometrics

Background:

  • Cannabis use is prevalent, necessitating accurate measurement of associated problems.
  • Existing measures may not adequately capture the multi-dimensional nature of cannabis-related issues.
  • Developing a reliable and valid instrument is crucial for treatment outcome assessment and research.

Purpose of the Study:

  • To develop and validate a multi-dimensional measure of cannabis-related problems.
  • To adapt an existing instrument (Alcohol Problems Questionnaire) for cannabis use.
  • To establish the reliability and validity of the new Cannabis Problems Questionnaire (CPQ).

Main Methods:

  • The Cannabis Problems Questionnaire (CPQ) was developed and administered to adults with recent cannabis use.

Related Experiment Videos

  • Exploratory factor analyses were performed to determine the underlying structure of the CPQ.
  • Test-retest and inter-rater reliability were assessed, alongside correlations with daily use and dependence measures.

    • Main Results:

    • Exploratory factor analyses identified a three-factor solution explaining 57% of the variance.
    • The CPQ demonstrated high reliability: test-retest correlations (0.92-1.00) and inter-rater reliability (0.74-1.00).
    • The CPQ score accurately classified DSM-IV cannabis dependence (84% sensitivity/specificity) and daily use (83% specificity).

    Conclusions:

    • The 22-item CPQ is a valid, reliable, and sensitive measure for assessing cannabis-related problems.
    • The CPQ is suitable for use in both clinical and research populations of current cannabis users.
    • This instrument aids in the accurate assessment of cannabis use disorders and treatment outcomes.