Designing and Evaluating the Reliability and Validity of Gambling Addiction Screening Questionnaire Among Substance Use Disorders

Comorbidity of gambling disorder as a the first recognized nonsubstance behavioral addiction, with substance use disorder is common. The aim of this study was developing a Persian version of Gambling Addiction Screening Questionnaire to screen the Gambling addiction among substance use disorders in Tehran.
This study was a methodological investigation. The item pool was generated based on gambling addiction questionnaires and validity of the GASQ was evaluated. Clients of substance use mid-term treatment centers in Tehran participated in the study through the clustered sampling and reliability was evaluated using Cronbach’s alpha and Interclass Correlation Coefficients (ICC).
The S-CVI was 70% for clarity, 81% for relevancy, and 100% for comprehension. The face validity of the scale were appropriate. The scale was inter-rater reliable and the Cronbach's alpha for GASQ (last year) was 0.960 and for GASQ (for life) was 0.938. The internal consistency GASQ (last year) was 0.386 to 0.778 and for GASQ (for life) was 0.416 to 0.740.
GASQ is a valid and reliable scale for screening gambling addiction among substance users.