Table 2.

The pre-determined form used to code the selected studies.

Reference	Authors’ names, research group (including the department, organization, and country), and the year published
Sample	Number of participants, age of participants (either mean and standard deviation, range, or percentage of young people), percentage of female participants, population targeted (ie, mental health status or risk profile)
Study design	Qualitative or quantitative (cross-sectional, quasi-experimental, longitudinal, RCT)
Program	Type of online mental health services examined (eg, information website, discussion forums, screening tool, online therapy)
Outcome	Outcomes studied (ie, mental health or help-seeking outcomes, user satisfaction, economic evaluation), the measures used to assess the outcome, and summary statistics reported