Table 1.

Inclusion and Exclusion Criteria

Component	Inclusion	Exclusion
Date range	From inception of database to October 2018
Language	English
Sample	Youth-sport participants with mean ages of 12–18 years	Participants younger than 8 or older than 20 years
Mental-health outcome measure (i.e., anxiety or depression)	Studies measuring self-reported symptoms of anxiety and depression
Sport-participation measure	Studies contrasting youth in relation to whether or not they were involved, sport volume, sport frequency, etc.	Nonsport forms of physical activity, vigorous exercise, and recreational activity
Organized sport (setting)	Participants completing sport-participation measures in relation to organized sport in the school or community	Any nonorganized sport participation (e.g., recess, free play, physical education)
Study design	Quantitative studies comparing sport participation to a different activity, to no sport participation, or to other level of sport participation; study designs including correlational (i.e., cross-sectional and prospective) cohort and experimental designs	Qualitative research, case studies, literature reviews