Since 1982 HBSC has been a pioneer cross-national study gaining insight into young people's well-being, health behaviours and their social context. This research collaboration with the WHO Regional Office for Europe is conducted every four years in 50 countries and regions across Europe and North America. With children and young people accounting for 42% of our world's population, HBSC uses its findings to inform policy and practice to improve the lives of millions of young people.