Table A2.

Synthesis of interventions retrieved from studies.

Type of Intervention	Author, Year [49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82]
Event history calendar	(Martyn et al., 2012)
Group discussion	(Beserra et al., 2008; Fonseca et al., 2010)
Interventions delivered through School-Based Health Centers	(Bersamin et al., 2018; Denny et al., 2012)
Peer education	(Hatami et al., 2015; Okanlawon and Asuzu, 2013; Stephenson et al., 2008, 2004)
Online intervention	(Aragão et al., 2018; Castillo-Arcos et al., 2016; Enah et al., 2015; Souza et al., 2017; Valli and Cogo, 2013)
Mobile phone intervention	(Alhassan et al., 2019; Cornelius et al., 2019, 2012; French et al., 2016; Hickman and Schaar, 2018; Rokicki et al., 2017) [49]
Combined interventions	(Aventin et al., 2015; Barnes et al., 2004; Beserra et al., 2017; Gallegos et al., 2008; Hirvonen et al., 2021; Madeni et al., 2011; Oliveira et al., 2016)
Workshops	(Amaral and Fonseca, 2006; Beserra et al., 2006; Camargo and Ferrari, 2009; Carvalho et al., 2005; Freitas and Dias, 2010; Gubert et al., 2009; Levandowski and Schmidt, 2010; Santos et al., 2017; Soares et al., 2008) [50]
Sex education sessions	(Dunn et al., 1998; Elliott et al., 2013; Golbasi and Taskin, 2009; Grandahl et al., 2016; Lieberman et al., 2000; Moodi et al., 2013; Rani et al., 2016; Serowoky et al., 2015; Walker et al., 2006; Yakubu et al., 2019)
Multiple interventions program	(Henderson et al., 2007; Jemmott III et al., 1998; Jemmott et al., 2015; Lonczak et al., 2002; Richards et al., 2019; Siegel et al., 1998; Tucker et al., 2007; Villarruel et al., 2010, 2006; Wight et al., 2002)