Reliability and validity of the Internet Gaming Disorder-20 Test among Vietnamese teenagers

Abstract

To validate the Vietnamese version Internet Gaming Disorder-20 (VN-IGD-20) Test for teenagers, a survey among 349 gamers, who were accepted in the interview, from secondary and high schools from 28 game stores was conducted in Hanoi, Vietnam. The IGD-20 Test comprised 20 items with six different dimensions, using a 5-point Likert scale. Exploratory factor analysis (EFA) and confrmatory factor analysis (CFA) were used to examine the validation; Cronbach’s Alpha was performed to test the reliability; and Latent class analysis (LCA) was applied to identify the level of internet gaming disorder (IGD). Moreover, the ROC curve diagram was used with the highest Youden’s Index parameter to determine the best cut-off point. CFA proved that the VN-IGD-Test with 17 items, which was divided into fve-factor dimensions. The model indexes of the Vietnamese questionnaire included RMSEA = 0.053; SRMR = 0.052; GFI = 0.929; TLI = 0.908 and CFI = 0.927. The values for Cronbach’s alpha coeffcient of each dimension ranged from 0.823 to 0.840. The LCA found out four levels of IGD: casual gamers, regular gamers, low-risk engaged gamers, and high-risk engaged gamers. Additionally, the optimal empirical cut-off point with the highest Youden’s Index was 47.5 (out of 85). The present study fndings illustrated that the VN-IGD-17 Test could be used as a valid and reliable tool for assessing internet gaming disorder in Vietnamese teenagers.