Document is current

Article History

Received: 18 January 2021

Accepted: 31 July 2021

First Online: 18 August 2021

Declarations

:

: All procedures were in accordance with the ethical standards of the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study received approval from the Danish Data Protection Agency (Record Number 2015-57-0008). Ethics approval is not necessary under Danish law as the study did not include human biological material. There is no formal agency for ethical approval of school surveys and register-based studies in Denmark. The data was managed and stored in servers held by Statistics Denmark, who offers remote access to linked data at the individual level; encrypted personal identification numbers ensured confidentiality and full anonymity. The Danish Data Protection Agency also approved the linking of survey data to registers and all local confidentiality and privacy requirements were met. Coordinators at the participating schools gave oral information about the survey to the students. Parental consent was not obtained for the participants. According to Danish law children can give consent based on their maturity. At the beginning of the questionnaire, the students had to read and accept an informed consent form that clearly expressed that participation was voluntary, individual data would be kept confidential, and their data could be used for research.

: Not applicable.

: The authors declare no conflict of interest.