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Related Experiment Videos

A marijuana screening inventory (experimental version): description and preliminary psychometric properties.

Dale Alexander1

  • 1Graduate School of Social Work, University of Houston, Houston, Texas 77204-4013, USA. dalexander@uh.edu

The American Journal of Drug and Alcohol Abuse
|September 27, 2003
PubMed
Summary

A new Marijuana Screening Inventory (MSI-X) shows promise for identifying at-risk marijuana use patterns. The MSI-X demonstrated good reliability and a nine-factor structure in a sample of Army reservists.

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Area of Science:

  • Psychometrics
  • Substance Abuse Research
  • Mental Health Screening

Background:

  • Increasing marijuana use prevalence necessitates better assessment tools.
  • Current screening methods for marijuana use are inadequate.
  • Culturally diverse messages about marijuana risks create assessment challenges.

Purpose of the Study:

  • To describe the development of the Marijuana Screening Inventory (MSI-X).
  • To evaluate the preliminary psychometric properties of the MSI-X.
  • To determine the factor structure and reliability of the MSI-X.

Main Methods:

  • The 39-item Marijuana Screening Inventory (MSI-X) was administered to 420 Army reservists.
  • Anonymous responses were collected, with 408 valid MSI-Xs analyzed.

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  • Exploratory factor analyses (principal components, varimax rotation) were conducted using SPSS.

    • Main Results:

    • Lifetime marijuana use was reported by 61% of participants.
    • The MSI-X demonstrated strong reliability (alpha = .89).
    • A nine-factor structure emerged, explaining 65.8% of the variance, with 6.12% scoring "suggestive of risk" and 7.84% scoring "at risk" for marijuana use.

    Conclusions:

    • The MSI-X exhibits potential as a reliable, marijuana-specific screening tool.
    • The nine-factor structure provides a basis for understanding marijuana use patterns.
    • Further psychometric refinement is recommended for the MSI-X, particularly for general mental health and primary care settings.