Two-armed, cluster, randimized feasibility trial investigating the feasibility of the Youth Aware of Mental Health (YAM) intervention provided 9th grade students.

Estimated 4% of adolescents aged 12-15 years' experience suicidal ideation increasing to 16% in 16-year-olds in school samples. Universal, up-stream prevention strategies such as school programs have been suggested and investigated, however, country specific feasibility insights are needed.

The aim is to evaluate the feasibility, acceptability, and fidelity of a school-based Youth Aware of Mental Health (YAM) programme in Danish 9th grade student as measured by 1) program participation and response rates, 2) student endorsement, and 3) manual adherence. Also, to explore whether the YAM-programme is associated with increased mental health awareness and lower rates of suicidal ideation and behaviour.

An RCT designed as a 2-arm observer-blinded, cluster-randomised feasibility trial, where students either receive the manualized YAM- program as add on to the general school curriculum or school curriculum as usual + posters. The feasibility trial will be conducted in 8-10 Danish public schools across the country. The goal of the YAM program is to raise student awareness about protective and risk factors for suicidal behaviour, enhance general knowledge on mental disorders, and improve coping strategies for dealing with adversities, such as negative life events and emotional distress. The manualized YAM-program has previously been linked to reductions in SI and DSH. The YAM-program consists of a booklet, posters, discussions, lectures, and role-playing games and will be delivered to students aged 15-16 years. During the 3-week of the intervention, 6 educational posters will remain on display in the classroom, also in the control schools. Secondary explorative outcomes include quality of life assessed by WHO Well-being Scale (WHO-5), which has been validated as a measure of adolescents' quality of life; psychological distress as measured by the Kessler's Psychological Distress Scale (K-10), a standard and validated tool; help-seeking intentions will be measured using the General help-seeking questionnaire, again a validated tool to measure mental health knowledge and literacy, respectively. Lastly, level of suicide stigma and literacy will be calculated from the validated Stigma of Suicide Scale. All questionnaires have been tested and found suitable for adolescents.

Inclusion criteria: The inclusion criteria for schools are public schools, which as a minimum have 2 parallel classes of 9th grade with students aged 15+ years.

Exclusion criteria: Schools specialized towards specific groups of students, such as vulnerable groups, and schools, which are providing treatment for students with special needs (in DK: behandlingsskoler og specialskoler) are omitted from participation in the trial. The reason is that these groups of students are considered particularly vulnerable, often with specific diagnoses and special needs for individual support, which do not correspond with the manualized YAM intervention. Boarding schools (in DK: efterskoler) with 9th grade students will be offered to serve as test schools during the training of YAM-instructors but are not eligible per se. Being boarding schools, social interactions between peers might differ in intensity and character from those of schools where children are living at home only attending during school hours.