Designing and Evaluating the Validity and Reliability of the Persian Gambling Disorder Screening Questionnaire.

Background: Gambling disorder (GD) and substance use disorder (SUD) have mutual impact and each could aggravate the effects of the other. This is the first study on GD among Iranian substance users to develop and validate a GD Screening Questionnaire-Persian (GDSQ-P).

Methods: Iranian male adults (n = 503) with SUDs were recruited via clustered sampling.