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

Credibility and expectancy are important aspects of therapy/treatment processes. We aimed to perform cross-cultural validation and examine the psychometric properties of the Credibility/Expectancy Questionnaire (CEQ). Ninety-one patients with opioid use disorder from Tobacco, Alcohol, and Drug Addiction Treatment Program were included in the study. Sociodemographic data form, CEQ, Beck Depression Inventory (BDI), State and Trait Anxiety Inventory (STAI), and Attitudes Toward Seeking Psychological Professional Help Scale-Short Form (ATSPPHS-SF) were filled out by participants. Confirmatory factor analyses showed that CEQ has two factors in our sample, similar to the original version. Reliability analyses showed that CEQ has a high internal consistency and test-retest reliability. Regarding convergent validity results, CEQ was correlated with ATSPPHS-SF. No significant correlation was found between CEQ and BDI and STAI regarding discriminant validity results. In conclusion, the Turkish version of CEQ is a valid, reliable scale and could be used in patients with opioid use disorder. In patients with opioid use disorder, we contributed to the addiction literature by adapting a short and effective survey that measures trust and expectation.