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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
Summary
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.
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.
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