The aim of the HBSC-Study is to collect data on the physical and mental health and health behaviour of children and adolescents and to gain a deeper insight into their situation and the specific environment they grow up in. The HBSC-study is an international school-based cross-sectional survey conducted in collaboration with the World Health Organization (WHO). The survey takes place every 4 years since 1982 and is based on a standardised protocol. In Germany the survey was first conducted in 1994 as a pilot study in North Rhine-Westphalia. The German sample is based on a random sample of classes in all public schools in Germany. 11-, 13-, and 15-year-old pupils are surveyed by means of a paper and pencil questionnaire. The questionnaire comprises a broad selection of -topics, including sociodemographics, health and risk behaviours, family, school and peers. The reported trends in the supplement are based on the data from surveys in 2002 (N=5.650), 2006 (N=7.274) and 2010 (N=5.005). The representative samples for each of the survey years are defined as follows: in 2002 the data is based on information collected in 4 Federal States (Berlin, Hesse, North Rhine-Westphalia, Saxony); in 2006 5 states define the German data file (Berlin, Hamburg, Hesse, North Rhine-Westphalia, Saxony). The data from the 2010 survey comprises data from 15 Federal States. The HBSC-data contributes towards a better understanding of the relationship between health and living conditions of young people. The papers in this supplement deliver important insights into the living context of young people and in doing this they provide important information about their health and the long-term effectiveness of public-health-measures.

Bullying also seems to be widespread in schools in Germany and is strongly associated with subjective health and substance-related risk behaviour. The results suggest that bullying is a critical issue that requires increasing attention in health research. The unique health problems of victims and perpetrators suggest different intervention strategies for both groups.

Bullying is a specific form of violence that can potentially lead to numerous and long-term negative health implications. Despite consistent coverage in the media, particularly on cyberbullying, as of yet there are only few representative findings on the frequency of (cyber)bullying in Germany. This article analyses how widespread bullying and cyberbullying were at schools in Germany in 2018, what differences exist between girls and boys, age groups and various types of schools, and changes in bullying trends between 2002 and 2018. Our findings are based on an analysis of the data provided by the 2017/18 cycle (N=4,347 students, 53.0% female) and previous cycles of the German Health Behaviour in School-aged Children (HBSC) study. In the 2018 cycle, boys reported having bullied other children more frequently than girls, but were bullied just as often. 15-year-olds reported having bullied other children more frequently than 11- to- 13-year-olds but reported being bullied less frequently. Students at grammar schools (Gymnasium) least frequently reported any involvement in bullying. Only few children and adolescents reported cases of cyberbullying. Compared to all previous survey years, 2018 saw the lowest number of children that reported having bullied others. However, reports of having been bullied have remained almost stable. The findings highlight the need for evidence-based prevention and intervention anti-bullying programmes and measures across all types of general education schools and age groups.

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Die Studie stellt die Situation zu Mobbing-Erfahrungen in den Bundesländern Hessen und Sachsen im Überblick dar und greift dabei auf die Daten der Erhebungswelle 2006 der HBSC-Studie zurück. Es wird untersucht, inwieweit über den Migrationshintergrund der Schüler hinaus andere Variablen der individuellen bzw. der Klassen- und Schulebene Einfluss haben.Etwa ein Drittel der Befragten gibt an, bereits Mobbing-Erfahrungen gemacht zu haben; ungefähr ein Viertel ist bereits als Mobbing-Täter auffällig geworden. Zudem erweist sich bei den Tätern das Geschlecht, das Alter sowie die Heterogenität bzw. der Migrantenanteil in der Klasse in unterschiedlicher Weise als relevant. Der Migrationshintergrund hat lediglich in Hessen Gewicht. Schüler mit niedrigerem sozioökonomischen Status zeigen ein erhöhtes Risiko, Mobbing-Opfer zu werden. Heterogene Klassen haben in Hessen einen positiven, in Sachsen einen ambivalenten Einfluss.