The main objective of this study was to examine the psychometric properties of the Korean version of the Internet Gaming Disorder Scale—Short Form (K-IGDS9-SF), a brief self-report instrument developed to assess Internet gaming disorder (IGD) in accordance with the Diagnostic and Statistical Manual of Mental Disorders-5th edition criteria. A total of 594 Korean game users (average age = 23.5 years, 70.37 percent male) participated and completed questionnaires containing the K-IGDS9-SF and other measures for its validation. The K-IGDS9-SF showed good reliability (Cronbach's α = 0.86, composite reliability coefficient = 0.87). Consistent with previous studies, the K-IGDS9-SF demonstrated a single-factor structure in a confirmatory factor analysis. Moreover, the K-IGDS9-SF had significant associations with related variables (IGD, game playing variables, self-esteem, impulsivity, and loneliness) in the expected direction, supporting its concurrent, criterion, and convergent validity. Taken together, these results indicated that the K-IGDS9-SF has satisfactory psychometric properties, suggesting its utility as a unified robust instrument for studying IGD worldwide.
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