Table 1.

Inclusion/exclusion criteria.

	Inclusion criteria	Exclusion criteria
Population	• LGBTQ ​+ ​youth under the age of 26 years old	• Non LGBTQ ​+ ​youth • LGBTQ ​+ ​people aged 26 and over
Intervention	• Early intervention services i.e. support and prevention prior to crisis care for LGBTQ+ ​youth experiencing common mental health problems: o anxiety o depression o obsessive-compulsive disorder (OCD) o self-harm o post-traumatic stress disorder (PTSD) o emerging personality disorders • Self-care support services i.e. a private, public or voluntary sector service, intervention or technology in which staff provide, facilitate and support self-care • Clinical, social, education, peer-support and online based services • Interventions delivered as part of a trial • Historic service provision	• Crisis care • Inpatient services • Mental health services for general youth population • Studies of ‘self-care’ only i.e. without the involvement of any service agent/staff
Findings	• Data on service user, family, carer, service provider and mental health support for LGBTQ ​+ ​youth • Empirical or conceptual data relevant to understanding early intervention/self-care mental health support for this population	• Empirical or conceptual data on inpatient mental health services/crisis support • Empirical or conceptual data on psychosis/other mental health conditions • Suicidality • Prevalence studies
Study details	• Peer-reviewed full text articles • Research published in books • Grey literature • All study designs • Published after 1990 • English, Spanish, Portuguese, Italian, French	• Opinion papers, editorials, dissertations and theses. • Published before 1990 • Published in any language other than English, Spanish, French, Italian, Portuguese