Table 1.

Summary of included studies.

		Angeles 2019 [49]	Goldstein 2020 [50]	Curtis 2018 [51]	Gee 2019 [52]	Hughes 2021 [53]	McMullen 2018 [54]	Travis 2019 [55]	King 2017 [56]	Marksteiner 2019 [57]	Shinde 2020 [48]	Kaesornsamut 2012 [58]	Hill 2017 [59]
	Sample size	2099	69	107	13	39	170	35	218	106	7824	60	5
Level	Universal		x				x	x		x	x
	Targeted	x							x				x
	Indicated			x	x	x						x
	Age Range	13–19 years	18–35 years	12–17 years	18–31 years	18–25 years	13–18 years	11–15 years	12–15 years	19.8 years *	13–15 years	16–18 years	13–15 years
Gender	Female Only				x
	Male and Female	x	x	x		x	x	x	x	x	x	x	x
	Country	Malawi	USA	USA	UK	USA	Uganda	Australia	USA	Germany	India	Thailand	USA
Outcome	Depression		x	x	x	x	x	x	x	x	x	x	x
	Anxiety		x	x	x	x	x	x					x

* No age range given; mean reported. Universal interventions are those which are delivered to all individuals in a given population, for instance, a whole class or school or town. Targeted interventions are those where participants are targeted based on some pre-existing risk factor which suggests that they are at greater need for intervention. Indicated interventions are for individuals who are already experiencing the outcome targeted by the intervention, for example, depression or anxiety.