RESUMO
Internet gaming disorder (IGD) is of growing importance as a research field and in clinical settings, as documented by the inclusion of the diagnosis in Diagnostic and Statistical Manual of Mental Disorders (DSM-5) and the preliminary International Classification of Diseases. Studies using screening tools to assess IGD and comparison with expert evaluations in clinical relevant populations are rare. Furthermore, concerned parents are often the first source of information in clinical practice, and their assessment of addictive behavior often differs widely from their child's self-evaluation. In two studies (N = 95) we investigated the usefulness of the Internet Addiction Test (IAT) and the Compulsive Internet Use Scale (CIUS) with adolescents at risk of IGD, either in parental company (Study 1) or alone (Study 2). Self-reported assessments on the scales were compared with parental ratings (only Study 1) and an expert face-to-face evaluation according to DSM-5 (both studies). We found higher correlations between expert evaluations of IGD criteria and screening scores for self-reported compared with parental ratings. Quality of categorization into persons with and without IGD confirmed that parental assessments were not conclusive in this setting. In this context, different cutoff values, sensitivity, and specificity for the screening instruments are discussed. We conclude that IAT and CIUS provide tentative usefulness for self-evaluation of adolescents at risk of IGD, and suggestions for using different cutoff scores for varying purposes are provided. In our study, parental assessments on the screening tools lead to an overestimation of IGD and are, therefore, not recommended as a sole source of information in clinical settings.