While the problematic use of Social Networking Sites (SNS) has been observed in some individuals, few validated and widely accepted measures are available to assess and screen for problematic use. This is an attempt at adapting the Diagnostic and Statistical Manual of Mental Disorders-based Internet Gaming Disorder Test-10 (IGDT-10) measure to assess SNS use disorder and problematic SNS use in the form of the SNS use disorder Test-10 (SNS-DT-10) questionnaire, and assessing its validity and reliability. The study was conducted in three phases: First, the IGDT-10 questionnaire was translated and adapted to assess SNS use disorder, and content validity was assessed. Then, a sample of 126 students from the Tehran University of Medical Sciences was used to determine internal consistency and construct validity using confirmatory factor analysis. Finally, retest data from 87 participants were used to estimate test-retest reliability. Item content validity indices were above .80 and scale content validity indices surpassed .83. The root mean square error of approximation for the 1-factor model was .04 and the comparative fit and Tucker-Lewis fit indices were .97 and .96, respectively, indicating appropriate construct validity. The intra-class correlation coefficient of the number of positive criteria for SNS use disorder was .81 and the Kappa coefficients for SNS use disorder and problematic SNS use were .85 and .57. Cronbach's alpha was .79 for the entire questionnaire. Overall, the SNS-DT-10 questionnaire has appropriate content and construct validity, internal consistency, and test-retest reliability. Further validation of this questionnaire in larger and more diverse samples and comparison with professional clinical diagnostic interviews are warranted.
Keywords: internet/gaming addiction; tests/questionnaires; translated questionnaires; validity of assessment.