Summary of quality appraisal results.

Summary of quality appraisal results.</p

Results of the effectiveness of mental health promotion interventions: Primary outcomes.

Results of the effectiveness of mental health promotion interventions: Primary outcomes.</p

Results of the effectiveness of mental health promotion interventions: Secondary outcomes.

Results of the effectiveness of mental health promotion interventions: Secondary outcomes.</p

Intervention characteristics of the included studies.

Intervention characteristics of the included studies.</p

PRISMA flow diagram.

PRISMA flow diagram.</p

Inclusion and exclusion criteria.

Inclusion and exclusion criteria.</p

Completed PRISMA 2020 checklist.

(DOCX)</p

Sample search strategy.

(PDF)</p

Study and sample characteristics.

Study and sample characteristics.</p

Outcomes of full-text review.

(DOCX)</p