Background: Pathological internet use is of increasing significance in several industrial nations. Sampling and Methods: We surveyed a representative German quota sample of 1,723 adolescents (aged 14-17 years) and 1 caregiver each. We conducted a latent profile analysis to identify a high-risk group for pathological internet use. Results: Overall, 3.2% of the sample formed a profile group with pathological internet use. In contrast to other published studies, the results of the latent profile analysis were verified not only by self-assessments of the youth's but also by external ratings of the caregivers. In addition to the pathological internet use, the high-risk group showed lower levels of family functioning and life satisfaction as well as more problems in family interactions. Conclusions: The results showed a considerable prevalence of pathological internet use in adolescents and emphasized the need for preventive and therapeutic approaches.

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