The report releases data from 42 countries on a range of new topics, such as peer relationships and family support, the school environment, migration, cyber-bullying and serious injury, with the more traditional data on alcohol and tobacco consumption, mental health and nutrition-related behaviour. The report provides data on gender differences and behaviour change in the 11–15-year age group, years that mark a period of increased autonomy that can influence how health and health-related behaviour develops and continues into adulthood. The report highlights socioeconomic differences and variations between countries and regions. It identifies opportunities for policy interventions, as the findings underline the importance of the wider social context and the effect it can have on young people's health.