A multilevel longitudinal study of adolescent Internet addiction: The role of obsessive–compulsive symptoms and classroom openness to experience

Internet addiction (IA) in adolescence was longitudinally examined in relation to individual obsessive–compulsive symptoms and the personality trait of openness to experience (OTE) at the classroom level. The study consists of a two-point measure of a normative sample comprising 648 Greek adolescents (retention = 363, age 16–18 years, wave 1: age = 15.75 years, SD = 0.57, males = 46.2%, females = 53.8%). IA was assessed with the IA Test (Young, K. S. [1998]. Caught in the net: How to recognize the signs of internet addiction—And a winning strategy for recovery. New York, NY: Wiley), obsessive–compulsive symptoms with the Symptom check list 90 revised (Derogatis, L. R., & Savitz, K. L. [1999]. The SCL-90-R, brief symptom inventory, and matching clinical rating scales. In M. E. Maruish (Ed.), The use of psychological testing for treatment planning and outcomes assessment (2nd ed., pp. 679–724). Mahwah, NJ: Lawrence Erlbaum Associates Publishers) and OTE with the FFFK (Asendorpf, J. D., & van Aken, M. A. G. ...