Psychometric Properties of the Credibility/Expectancy Questionnaire in Individuals with Opioid Use Disorder

Area of Science:

• Psychiatry
• Clinical Psychology
• Addiction Medicine

Background:

• Credibility and expectancy are crucial for effective therapy outcomes.
• Assessing these factors in diverse populations requires culturally validated instruments.
• Opioid use disorder (OUD) treatment success can be influenced by patient trust and expectations.

Purpose of the Study:

• To cross-culturally validate the Credibility/Expectancy Questionnaire (CEQ) in a Turkish sample.
• To examine the psychometric properties of the CEQ for patients with opioid use disorder.
• To establish the reliability and validity of the Turkish CEQ for addiction research.

Main Methods:

• Ninety-one patients with OUD completed the CEQ, Beck Depression Inventory (BDI), State and Trait Anxiety Inventory (STAI), and Attitudes Toward Seeking Psychological Professional Help Scale-Short Form (ATSPPHS-SF).
• Confirmatory factor analysis was used to assess the CEQ's factor structure.
• Reliability (internal consistency, test-retest) and validity (convergent, discriminant) were evaluated.

Main Results:

• Confirmatory factor analysis confirmed a two-factor structure for the CEQ, consistent with the original version.
• The Turkish CEQ demonstrated high internal consistency and test-retest reliability.
• Convergent validity was supported by a significant correlation with the ATSPPHS-SF; discriminant validity was supported by non-significant correlations with BDI and STAI.

Conclusions:

• The Turkish version of the CEQ is a valid and reliable measure for assessing credibility and expectancy in patients with opioid use disorder.
• This validated instrument can be utilized in clinical practice and research within addiction treatment programs.
• The study contributes a brief, effective tool to the addiction literature for measuring patient trust and expectations.