Table 1.

Detailed description of reviewed articles

First author (year)	Country; recruitment sources	Study participants	Intervention; prevention level	Comparison	Outcomes (measures)
Antonson (2018)	Sweden; two secondary schools	Upper secondary school students; aged 15–19 years; 70.3% female	Internet-based self-help mindfulness-based program accessible through computers, smartphones, and tablets; Universal prevention	Wait-list	Stress (14-item Perceived Stress Scale)
Bonnert (2017)	Sweden; primary, secondar,y and tertiary care clinics	Adolescents diagnosed irritable bowel syndrome; aged 13–17 years; 61.0% female	Internet-delivered cognitive behavior therapy; selective prevention	Wait-list	Anxiety (Spence Children’s Anxiety Scale) Stress (10-item Perceived Stress Scale)
De Voogd (2016a)_1	Netherlands; 14 regular high schools	Students in the 1st to 6th grade of high schools; aged 11–18 years; 57.6% female	Online attentional bias modification training (visual search attention training, dot-probe attention training); universal prevention	Placebo (visual search placebo, dot-probe placebo)	Anxiety (Screen for Child Anxiety Related Emotional Disorders) Depression (Children’s Depression Inventory)
De Voogd (2016b)_2	The Netherlands; 14 regular high schools	High school students; aged 11–18 years; 60.1% female	Online emotional working memory training; universal prevention	Placebo	Anxiety (Screen for Child Anxiety Related Emotional Disorders) Depression (Children’s Depression Inventory)
De Voogd (2018)	The Netherlands; 14 regular high schools	Students in the 1st to 6th grade of high schools; aged 11–19 years; 60.7% female	Online interpretation bias modification training; universal prevention	Placebo	Anxiety (Screen for Child Anxiety Related Emotional Disorders) Depression (Children’s Depression Inventory)
Duan (2017)	China; one university	Undergraduate students; aged 17–24 years; 71.1% female	Web-based multiple health behavior intervention for physical activity and fruit and vegetable intake based on health action process approach; universal prevention	No intervention	Depression (Center for Epidemiologic Studies Depression)
Fang (2010)	USA; Asian community service agencies in 19 states with significant Asian populations	Asian–American adolescent girls; aged 11–14 years; all females	Web-based Mother-Daughter program (family-oriented substance use prevention program based on family interaction theory); universal prevention	No intervention	Depression (Children’s Depression Inventory)
Greene (2012)	USA; eight universities	Undergraduate students of freshmen, sophomores, and juniors; aged 18–24 years; 63% female	Online healthful eating and physical activity program; universal prevention	Wait-list	Stress (12-item General Health Questionnaire)
Kattelmann (2014)	USA; 13 college campuses	College student; aged 18–24 years; 67.2% female	Web-delivered Young Adults Eating and Active for Health program; universal prevention	Wait-list	Stress (14-item Perceived Stress Scale)
Law (2015)	USA; a headache clinic	Adolescents with recurrent headache; aged 11–17 years; 81.9% female	Internet-delivered family-based cognitive behavioral therapy program with headache treatment; selective prevention	Headache treatment	Anxiety (Revised Children’s Manifest Anxiety Scale, Second Edition) Depression (Children’s Depression Inventory)
Levin (2014)	USA; two local university and community college campuses, as well as advertisements in the local school newspapers and school websites	Undergraduate first-year students; aged 18–20 years; 53.9% female	Web-based acceptance and commitment therapy prevention program; universal prevention	Wait-list	Anxiety (7-item subscale assessing anxiety of the 21-item version of the Depression, Anxiety and Stress Scale) Depression (7-item subscale assessing depression of the 21-item version of the Depression, Anxiety and Stress Scale) Stress (7-item subscale assessing stress of the 21-item version of the Depression, Anxiety, and Stress Scale)
Newcombe (2012)	Australia; a respiratory outpatient clinic	Children and adolescents with a chronic respiratory condition; aged 10–17 years; 51.3% female	Internet-based problem-solving program; selective prevention	Wait-list	Depression (Center for Epidemiologic Studies Depression Scale for Children)
O’Dea (2020)	Australia; advertisement on Facebook campaign targeting young people	adolescents; aged 12–16 years; 86.5% female	Relationship-focused mobile phone application based on cognitive behavioral therapy and social learning theory; universal prevention	Wait-list	Anxiety (Spence Children’s Anxiety Scale) Depression (Patient Health Questionnaire for Adolescents)
Palermo (2009)	USA; multidisciplinary pediatric pain clinic, pediatric neurology clinic, and pediatric gastroenterology clinic at an academic health center	Children and adolescents with chronic pain; aged 11–17 years; 72.9% female	Internet-delivered family cognitive behavioral therapy intervention; selective prevention	Wait-list	Depression (Major depressive disorder subscale of the Revised Child Anxiety and Depression Scale)
Puolakanaho (2019)	Finland; two municipalities in Central Finland	Ninth-grade adolescents; aged 15–16 years; 49.0% female	Web- and mobile-delivered program based on acceptance and commitment therapy; universal prevention	Usual support from school	Stress (Single-item measure assessing overall stress)
Ruggiero (2015)	USA; two regions that sustained severe impact from tornadoes	Adolescents affected by devastating tornadoes; aged 12–17 years; 51.0% female	Web-based intervention for disaster-affected adolescents and parents; selective prevention	No intervention	Depression (National Survey of Adolescents Depression module)
Schwinn (2014)	USA; publicly subsidized housing	Adolescent girls lived in publicly subsidized housing; aged 10–12 years; all females	Web-based, family-involvement health promotion program; selective prevention	No intervention	Stress (6-item Perceived Stress Scale)
Whittaker (2017)	New Zealand; 15 secondary schools	Attending years 9–12 at participating schools; aged 13–17 years; 68.0% female	Mobile phone-delivered cognitive behavioral therapy-based program; universal prevention	Placebo	Depression (Children’s Depression Rating Scale-Revised)
Williamson (2019)	UK; primary care practices and charities	Adolescents with appearance-affecting conditions experiencing appearance-related distress, teasing or bullying; aged 12–17 years; 74.5% females	Web-based self-help psychosocial intervention integrating cognitive behavioral therapy and social skills training; selective prevention	Usual care	Social anxiety (22-item Social Anxiety Scale)