Context

Depression in adolescence is common worldwide and although it is treatable, only a minority receive evidence-based interventions.1 ,2 A recent report by the WHO identifies depression as the leading cause of illness and disability in adolescents and highlights the importance of a coordinated approach to care.3 A Cochrane review has shown collaborative care interventions to improve depression in adults treated in primary care, but few studies have examined whether these interventions are effective in adolescents.4 This randomised controlled trial examines whether collaborative care interventions adapted for adolescents with depression improve outcomes compared with usual care.