Level of intervention	Reference	Where was the intervention designed?	Who delivered the intervention? Were program deliverers local or external to the community?	Scale of the intervention	Framework	Fixed vs tailored contents
Level 1	Akiyama et al. [26]	Outside the country	Local teachers	School-wide (across 1 school)	The Mastery Approach to Coaching (MAC), based on goal orientation theory	Fixed
	Decosimo et al. [37]	Same country where the intervention was implemented	Local psychosocial workers and community members	Nation-wide, 40 sites	Art therapy, yoga therapy, play therapy, child development	Fixed
	Hasanudin et al. [28]	Outside the country	Researchers from the same country, but it was not mentioned if they belonged to the community	Information not provided	Therapeutic Group Therapy	Fixed
	Malboeuf-Hurtubise et al. [35]	Same country where the intervention was implemented	Undergraduate psychology students under the supervision of a clinician, it was not mentioned if they belonged to the community	1 classroom in an elementary school	Art therapy and mindfulness	Fixed
	Malbouef-Hurtubise et al. [34]	Same country where the intervention was implemented	Undergraduate psychology students under the supervision of a clinician, it was not mentioned if they belonged to the community	1 classroom in an elementary school	Philosophy for children (P4C) and mindfulness-based interventions (MBIs)	Fixed
	Osofsky et al. [33]	Same community where the intervention was implemented	Local teachers and mental health professionals	School-wide	Community-based and mental health approaches to stress reduction and self-awareness	Tailored to the community
Level 2	Amin et al. [27•]	Outside the country	External clinicians with local non-clinical staff	Regional (across 5 elementary public schools in three rural union councils)	Cognitive-Behavioural Intervention for Trauma in Schools	Fixed, but tailored to the local languages
	Ding and Yao [29•]	Same country where the intervention was implemented	Researchers from the same country, but it was not mentioned if they belonged to the community	Across 2 regions in China	Health education, evidence on the effects of exercise on physical and mental health	Fixed
	Yuan [30]	Information not provided	Local teachers	Information not provided	Mindfulness	Fixed
	Yustiana et al. [31]	Information not provided	One researcher from the same country where the intervention was delivered	Information not provided	Group play therapy	Information not provided
Level 3	Lee and Simpson [32]	Same country where the intervention was implemented	Clinicians from the Paediatric Emergency Department where the intervention was delivered	One Paediatric Emergency Department	Cognitive-behavioural therapy	Fixed
	Stasiak et al. [38]	Outside the country	The online intervention was implemented with minimal involvement from clinical and occupational therapists	City-wide	Cognitive-behavioural therapy	Fixed
	Trentini et al. [36•]	Outside the country	EMDR therapists working in pairs, who were from the same country or region where the intervention was implemented	Regional	EMDR-IGTP, based on the Standard EMDR Protocol with elements from group and art therapy	Fixed, but the protocol was adjusted to each patient’s symptoms, stage of development and response to treatment