Methods	Quasi‐randomized and natural experiment in India Study conducted during 2014
Participants	Adolescents in rural areas of selected districts of Bihar. A survey was conducted of 371 and 679 young men and women from control areas, and 789 and 1382, respectively, from intervention areas. 40 selected intervention villages and 20 selected control villages. Participants were aged 13–21 at time of training.
Interventions	Intervention: Prachar Project's reproductive health training programme for adolescents, which consists of three day training and focuses on addressing adolescents' need for information, contraceptive supplies, parental and community support, and a youth‐friendly health system. This aimed specifically at raising awareness and understanding of sexual and reproductive importance of delayed childbearing and spacing of pregnancies, and sources of services among unmarried adolescents. Two types of project settings: one in which no other PRACHAR Phase III activities were conducted (standalone settings) and a second (comprehensive settings) in which the adolescent training programme was conducted along with other activities of PRACHAR Phase III among married women and men more generally. Control: a cohort of similar young people not exposed to the programme. Setting: community‐level Timing of intervention: Moderators delivering: Two female trainers implemented the programme for girls, and one male and one female did so for boys.
Outcomes	Primary: young people's awareness of sexual and reproductive health matters, their gender role attitudes and such behaviours as delayed marriage and postponement of the first birth; the extent of safe and wanted pre‐marital sexual experiences; agency (particularly among young women), notably with regard to participation in marriage related decision‐making and other life choices (education, work, control over resources); and timely access to sexual and reproductive health services Namely knowledge and behaviour Secondary
Notes	Main outcomes interested in: pre‐marital sexual experiences (if any, including age at sexual initiation, partners, and contraception and condom use), and awareness about sexual and reproductive health matters. Funding: David and Lucile Packard Foundation Declaration of interest: NA