Funding for this research was provided by:
National Board of Health and Welfare (2013-01536)
Received: 2 April 2020
Accepted: 15 January 2021
First Online: 23 January 2021
Ethics approval and consent to participate
: The data used in the present study were drawn from the YeS project. The methods and procedural used as part of the YeS project to collect data was approved by the regional Ethics Review Board in Uppsala, Sweden (DNR: 2015/330). Passive informed consent was obtained from the parents of the adolescents. Specifically, parents received an information letter by regular post with a description of the project, and were asked to return a written postcard in a pre-paid envelope if they wanted to refuse the participation of their offspring in the study. In addition, adolescents were informed about the study procedure, including a statement about the voluntary nature of participation and confidentiality of information, and an assurance that they could quit the study at any time by informing any one of the research assistants.
: Not Applicable.
: The dataset generated and analyzed during the current study is not publicly available due to its longitudinal nature and the sensitivity of the questions, but is available from the corresponding author on reasonable request.
: The authors declare that they have no competing interests.