“…There are five types of study designs implemented among the 22 quantitative interventions and they are: (1) pre–post design by comparing the outcome indicators of the same participants before and after the intervention (Allen et al, 2009; Operario, Smith, Arnold, & Kegeles, 2010); (2) cluster randomized controlled trial (RCT) with schools (Kumakech, Cantor-Graae, Maling, & Bajunirwe, 2009) and villages (Apinundecha, Laohasiriwong, Cameron, & Lim, 2007) as the randomization unit, respectively; (3) RCT at the individual level (Lee, Detels, Rotheram-Borus, & Duan, 2007; Munoz et al, 2010; Rotheram-Borus, Stein, & Lester, 2006; Sacks, McKendrick, Vazan, Sacks, & Cleland, 2011; Weiss et al, 2011); (4) post-intervention cross-sectional survey (Horizons, 2006, 2007; MEASURE, 2009a, 2009b, 2009c; Ramirex-Vallez et al, 2005; Thurman et al, 2006); and (5) quasi-experimental design with a comparison group (Clacherty & Donald, 2006; Heckman et al, 2006; Lavin, Kali, & Haas, 2010; MEASURE, 2009d, 2009e; Mueller et al, 2011). Among these quasi-experimental studies, only two reported both baseline and single point follow-up information with the follow-up periods ranging from 3 to 18 months.…”