Reliability and Validity of the Japanese Version of the Internet Gaming Disorder Scale for Children (IGDS-C)

Abstract

Aim: The Internet Gaming Disorder Scale is a 9-item screening instrument developed based on the diagnostic criteria for Internet Gaming Disorder (IGD) in the DSM-5. This study aimed to examine the reliability and validity of the Internet Gaming Disorder Scale for children (IGDS-C) in Japanese clinical and nonclinical populations. Methods: The study included clinical outpatients aged 9–29 with problematic game use and nonclinical adolescents aged 12–18 who played online games at least once a week. Reliability was examined by calculating internal consistency and test–retest reliability. Validity was assessed using Spearman's correlation and Confirmatory Factor Analysis (CFA). Results: A total of 746 participants (93 clinical, 653 nonclinical) were eligible for statistical analysis. Reliability results revealed acceptable internal consistency (Cronbach's α = 0.87) and test–retest reliability (intraclass correlation coefficient = 0.62). CFA results (Comparative Fit Index = 0.92, Tucker–Lewis Index = 0.90, root mean square error of approximation = 0.10, standardized root mean square residual = 0.05, factor loadings = 0.59–0.71) and significant correlations with the GAMES test, psychological distress, and gaming hours verified the validity of the IGDS-C. Conclusion: The study verified the reliability and validity of the IGDS-C in Japanese clinical and nonclinical participants, suggesting that it generally reflects the severity of IGD well.