Methods	Quasi experimental study. A community‐randomised trial in Tanzania (cluster RCT) Study conducted between late 1998 and April 2002
Participants	Twenty communities were randomly allocated, 9645 adolescents recruited in late 1998 before entering years 5, 6 or 7 of primary school. Minimum age was 14 and mean age was 15.7 years.
Interventions	Intervention: This intervention aimed to provide young people with the knowledge and skills to enable them to delay sexual debut, reduce sexual risk‐taking by sexually active youth and increase their appropriate use of sexual health services. Community activities; teacher‐led, peer‐assisted sexual health education in Years 5‐7 of primary school; training and supervision of health workers to provide “youth‐friendly” sexual health services; and peer condom social marketing. Control: standard activities Setting: Community based Timing of intervention: Moderators delivering: teachers, health workers, peer‐elected youth for condom distribution, local youth groups
Outcomes	Primary: Knowledge, attitude, HIV, herpes simplex virus 2 (HSV)
Notes	Funding: supported by grants from the European Commission, Development Cooperation Ireland (now Irish Aid), UK Medical Research Council, UNAIDS, and UK Department for International Development.Declaration of interest: NA