The Chen Internet Addiction Scale (CIA) is a 4-point, self-reported questionnaire comprising 26 questions that assess the five dimensions of Internet use-related problems, namely compulsive use, withdrawal, tolerance, interpersonal and health problems, and time management problems [25]. The scale has good reliability and validity. The internal reliability of the scale and the subscales in the original study ranged from 0.79 to 0.93. Higher CIA scores indicated greater severity of IA. The CIA scale has good diagnostic accuracy (89.6%). The screening cut-off point has high sensitivity (85.6%), and the diagnostic cut-off point has high diagnostic accuracy, as indicated by the correct classification rate of 87.6% of the participants.
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