Table 3.

Data extraction and synthesis coding schema.

Data extraction code & definition	Sub-codes
Context: Describes the setting in which the research or discussion about mental health support takes place	Clinical, Community, Online, Other, School
Finding: Any findings in the papers	Conceptual, Empirical
Study Design: Explicit research design stated	Quantitative, Qualitative, Mixed Method, Systematic review, Other e.g. clinical case
Theoretical Perspective: Explicit statement about the theoretical orientation of the study
Intervention/service: The intervention or support service that the study involves.
Synthesis code & definition	Sub-codes
Help-seeking: Conceptualization of help-seeking	Access, Autonomy, Barriers, Cycle of avoidance, Health behaviour, Health information, Other, Power(lessness), Stigma
LGBTQ+ ​Identities: Conceptualization of relationship between LGBTQ ​+ ​identities and mental health	Decompensation model, Essentialist, Heteronormativity, Homophobia, Intersectionality, Marginalisation, Minority Stress, Psychological Mediation Framework, Victimization
Mental Health: Conceptualization of mental health	Biomedical, Critical, Individualising, Other, Pathologizing, Psychological, Psycho-social
Youth: Conceptualization of youth	Adolescent psychological development, Autonomy, Biological, Other