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. 2015 Aug;39(4):395-427.
doi: 10.1177/0193841X15599645. Epub 2015 Aug 14.

Validation of the Full and Short-Form Self-Help Involvement Scale Against the Rasch Measurement Model

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Free PMC article

Validation of the Full and Short-Form Self-Help Involvement Scale Against the Rasch Measurement Model

Karen M Conrad et al. Eval Rev. .
Free PMC article

Abstract

Background: Substance use disorders (SUDs) are one of the nation's most costly problems in terms of dollars, disability, and death. Self-help programs are among the varied recovery support options available to address SUD, and evaluation of these programs depends on good measurement. There exists an unmet need for a psychometrically sound, brief, efficient measure of self-help involvement for individuals with SUD that is valid across different substances and age-groups.

Methods: Using data from 2,101 persons presenting for SUD treatment, the full 21-item Global Appraisal of Individual Needs Self-Help Involvement Scale (SHIS) and a newly developed 11-item short-form version were validated against the Rasch measurement model and each other. Differential item functioning (DIF) was assessed by primary substance and age.

Results: Both versions met Rasch psychometric criteria. The full scale had minor misfit with no DIF for alcohol, marijuana, or opioids but a few instances of DIF for amphetamine and cocaine users as well as for age, in that youth tended to endorse several easier items more frequently than did adults. The 11-item short form had neither misfit nor DIF by substance and only minor DIF by age was highly correlated with the full version and was relatively more efficient. Criterion-related validity was supported for both.

Conclusions: Both the long and short versions of SHIS are psychometrically sound measures of a more comprehensive conceptualization of self-help involvement for SUDs that can be used as part of an in-depth assessment or as a short measure that lessens respondent burden.

Keywords: measurement; methodology; substance abuse treatment and prevention.

Conflict of interest statement

Declaration of Conflicting Interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1
Figure 1
Self-help Involvement Scale Wright maps simultaneously displaying item difficulty (endorsability) hierarchy and person ability (level of self-help involvement). Map A: full 21 item version. Map B: 11-item short form version. The 11 items highlighted in Map A are those deleted in the short-form. Explanatory details of Wright Map are provided in the text boxes.
Figure 1
Figure 1
Self-help Involvement Scale Wright maps simultaneously displaying item difficulty (endorsability) hierarchy and person ability (level of self-help involvement). Map A: full 21 item version. Map B: 11-item short form version. The 11 items highlighted in Map A are those deleted in the short-form. Explanatory details of Wright Map are provided in the text boxes.

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