Table 1.

Eligibility and exclusion criteria

	Eligibility	Exclusion
Population	Mean age between 10 and 19 years old with any gender and ethnicity.	Mean age younger than 10 years old or older than 19 years old.
Intervention	Any interventions/programmes/campaigns for mental health stigma reduction.	Anti-stigma interventions/programmes/campaigns not related to mental health, such as anti-stigma for HIV or disability.
Comparator	At least one control group.	No comparator.
Outcome	The degree of reduction of mental health stigma.	Degree of stigma reduction was not related to mental health.
Study design	Randomised controlled trials, cluster-randomised trials and quasi-experimental designs.	Other study designs, such as qualitative study and case study.