School-Based Prevention of Mental Illnesses in Adolescents: Studies on a Screening Instrument and on the Conceptualization and Effectiveness of the StresSOS Program

Mental health problems in childhood and adolescence are a worldwide issue and increasingly lead to reduced quality of life and premature death. Therefore, psychometrically valid approaches to diagnosis and approaches for the effective prevention of mental illness in children and adolescents are urgently needed. The aim of this thesis was to contribute to research into diagnostics and prevention.

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