Evaluation of Psychometric Properties of the Internet Addiction Scale in a Sample of Turkish High School Students

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Abstract
The Internet Addiction Scale (IAS) is a self-report instrument based on the seven substance dependence criteria of the Diagnostic and Statistical Manual of Mental Disorders (4th ed., American Psychiatric Association, 1994) and two additional criteria recommended by Griffiths. The IAS was administered to 300 high school students along with the Beck Depression Inventory (BDI) and Submissive Acts Scale (SAS). For test–retest reliability, the IAS was administered a second time 7 days after the first administration. An interitem reliability reduced the initial scale from 31 to 27 items (with Cronbach's α of 0.94). The factor analysis suggests the existence mainly of one factor in the IAS. Correlation analyses indicated that BDI and SAS were significantly correlated positively with the IAS. One-week test–retest correlation for the IAS was highly significant. According to these results, the psychometric properties of the IAS are promising.