Received: 20 July 2021
Accepted: 12 January 2022
First Online: 24 January 2022
: The Regional Committee for Medical and Health Research Ethics (REC) for South-East Norway approved the project, registration number 2017/1908. We confirm that all methods were performed in accordance with the relevant guidelines and regulations. The research has been performed in accordance with the Declaration of Helsinki. The teachers were instructed not to perform therapy, but to contact health professionals at school if they suspected major mental health problems or risk of suicide. For students, speaking in class was voluntary. Teachers were not allowed to explicitly ask individual students about their experiences, because the teachers must at all times speak to the whole class.
: All adolescents [CitationRef removed years of age] with written consent from parents/legal guardians were included in the study. We conform that informed written consent was obtained from all parents/legal guardians. According to Norwegian law and REC, participants who were 16 years of age and older can respond on the consent in the online questionnaire without consent from parents. We conform that informed written consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.