Puupponen, Maija
Tynjälä, Jorma
Välimaa, Raili
Paakkari, Leena
Funding for this research was provided by:
University of Jyväskylä
Article History
Received: 19 January 2022
Accepted: 13 January 2023
First Online: 6 February 2023
Declarations
:
: The study was conducted according to the guidelines of the Declaration of Helsinki, and it obtained ethical approval from the University of Jyväskylä Ethical Committee. The school principals gave school-level approval. Participation was anonymous and voluntary, and some schools required active parental/guardian consent. Informed consent was obtained from all subjects involved in the study. The Co-Principal Investigators of the national HBSC team in Finland, Nelli Lyyra and Leena Paakkari, gave permission to use Finnish national data.
: Not applicable.
: The authors declare that they have no competing interests.