Table 1.

Search terms and eligibility criteria

Component	Search terms	Eligibility criteria
		Included	Excluded
Type of intervention	‘MHPSS’ OR ‘mental health’ OR ‘psychosocial’ OR ‘psychological’	Any publication year due to specificity of topic	Pharmacological interventions
Intervention words	‘Intervention’ OR ‘programme’ OR ‘service’ OR ‘healing’ OR ‘rehabilitation’ OR ‘therapy’
Type of mental health condition	‘Post-traumatic stress disorder’ OR ‘PTSD’ OR ‘trauma’ OR ‘depression’ OR ‘anxiety’ OR ‘fear’ OR ‘distress’	If intermediate and/or primary outcomes were mental health indicators or constructs	Languages other than English
Setting	‘Post-conflict’ OR ‘conflict affected’ OR ‘humanitarian setting’ OR ‘internally displaced’ OR ‘IDP’ OR ‘camp’ OR ‘settlement’	Only populations living in IDP settings All ages can be affected by conflict and are found in IDP settings
Location	‘Low and middle income countries’ OR ‘LMIC’ OR ‘low-resource setting’	Grey literature: journal articles, theses, websites, reports, books and news articles

MHPSS interventions were ‘any type of local or outside support that aims to protect or promote psychosocial well-being and/or prevent or treat mental disorders’ (IASC, 2020). Grey literature was included so as to capture humanitarian work not published in academic journals. Utilising a diverse range of literature also provides an opportunity for richer theory development (Bunn et al., 2016). Grey literature sources included: UNHCR, UNFPA, UNICEF, World Health Organization, International Rescue Committee, International Organization for Migration, Médecins Sans Frontières and ALNAP. Due to limitations of the search tools on the ALNAP website, we searched the term ‘Yazidi’, as this was assumed to include all relevant data to the target population.