| The 7-item Gaming Addiction Scale (GAS) is a brief instrument based on DSM criteria
to assess gaming addiction. Although the psychometric properties of the GAS have
been tested using classical test theory, its psychometric properties have never been
tested using modern test theory (e.g., Rasch analysis). The present study used a large
adolescent sample in Iran to test the psychometric properties of the Persian GAS
through both classical test and modern test theories. Adolescents (n = 4442; mean
age = 15.3 years; 50.3% males) were recruited from Qazvin, Iran. In addition to the GAS,
all of them completed the following instruments: the nine-item Internet Gaming Disorder
Scale–Short Form (IGDS-SF9), Depression Anxiety Stress Scale (DASS), Pittsburgh
Sleep Quality Index (PSQI), and a generic quality of life instrument. Two weeks later, all
participants completed the GAS again. Confirmatory factor analysis (CFA) and Rasch
analysis were used to test the unidimensionality of the GAS. Pearson correlation
coefficients were used to test the test-retest reliability, and a regression model was
used to test the criterion-related validity of the GAS. Both CFA and Rasch analysis
supported the unidimensionality of the GAS. Pearson correlations coefficients showed
satisfactory test-retest reliability of the GAS (r = 0.78 to 0.86), and the regression model
demonstrated the criterion-related validity of the GAS (β = 0.31 with IGDS-SF9; 0.41
with PSQI). Based on the results, the Persian GAS is a reliable and valid instrument for
healthcare providers to assess the level of gaming addiction among Persian-speaking
adolescents. |