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Article History

Received: 7 July 2023

Accepted: 22 September 2023

First Online: 13 October 2023

Declarations

:

: The authors declare no competing interests.

: Ethical approvals from the Regional Ethics Committee at Lund University were obtained in 2005 (Dnr 49/2006, regarding the data collections at T1 and T2) and 2016 (Dnr 2016/1059, regarding data collection at T3). Concerning data collection at T1 and T2, informed consent was obtained by sending written information by letter to the parents of all students and by handing out information directly to all students in school. This information described the study and stated that participation was voluntary. Parents or students could refrain from participation by telling their respective teachers or by contacting the researchers directly. Concerning data collection at T3, eligible participants received information about the study and were informed that their participation was voluntary before they gave their informed consent.

: Not applicable.