Funding for this research was provided by:
Grantová Agentura České Republiky (17-12579S)
European Regional Development Fund (CZ.02.1.01/0.0/0.0/16_025/0007294)
Ministerstvo Školství, Mládeže a Tělovýchovy (LTT18020)
Technologická Agentura České Republiky (TL01000335)
Received: 6 June 2019
Accepted: 7 February 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: The Institutional Research Ethics Committee of the Faculty of Physical Culture, Palacký University Olomouc, approved the design of the study, the course of preparation and execution of the research, an opt-out method for collecting parental consent, and the processing of the data on 4th March 2016, with the reference no. 9/2016. All the adolescents, teachers, and school management members received detailed information on the survey design and data collection plan at a meeting at each of the participating schools. The adolescents’ parents were informed about the survey and its design and content via the school management in advance and could withdraw their child if they wished. They received the information on the goal, content and course of the research, as well as possibility of opting their child out during parent-teacher conferences or, if absent, via e-mail. Written informed consent was obtained from all participants. In each cycle of data collection, the participation of adolescents was voluntary and without any financial incentives.
: The authors declare that they have no conflict of interest.