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The Marijuana Screening Inventory (MSI-X): concurrent, convergent and discriminant validity with multiple measures.

Dale Alexander1, Patrick Leung

  • 1Graduate College of Social Work, University of Houston, Houston, Texas 77204-4013, USA. dalealexander@sbcglobal.net

The American Journal of Drug and Alcohol Abuse
|July 26, 2006
PubMed
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The MSI-X tool demonstrates strong validity for assessing substance abuse. It shows concurrent, convergent, and discriminant validity when compared with established screening instruments.

Area of Science:

  • Psychometrics
  • Substance Abuse Research
  • Clinical Psychology

Background:

  • The Measurement of Substance Involvement-X (MSI-X) is a screening tool for substance abuse.
  • Validating new screening tools against established measures is crucial for clinical utility.

Purpose of the Study:

  • To evaluate the concurrent, convergent, and discriminant validity of the MSI-X against five other instruments.
  • To confirm the scoring cutoff for the MSI-X.

Main Methods:

  • 107 adults completed the MSI-X and other validated instruments.
  • Pearson correlation analysis and t-tests were used to assess validity.
  • The MSI-X was compared with the Drug Abuse Screening Test (DAST-20), Substance Abuse Subtle Screening Inventory (SASSI-3), a Marijuana Inventory, and the Addiction Severity Index.

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Main Results:

  • The MSI-X showed concurrent validity with DAST-20, SASSI-3 subscales, Marijuana Inventory, and Addiction Severity Index variables.
  • Discriminant validity was supported by a lack of correlation with alcohol measures.
  • Convergent validity was confirmed by associations between MSI-X scores and SASSI-3 substance dependence scores, supporting the MSI-X >= 6 cutoff.

Conclusions:

  • The findings support the concurrent, convergent, and discriminant validity of the MSI-X.
  • The MSI-X is a valid tool for substance abuse screening.