Swinkels, Aafke http://orcid.org/0000-0003-0172-5727
van den Broek, Nina http://orcid.org/0000-0002-9176-8255
Cillessen, Antonius H. N. http://orcid.org/0000-0002-5884-907X
Article History
Received: 15 March 2024
Accepted: 13 September 2024
First Online: 25 September 2024
Compliance with Ethical Standards
:
: The authors declare no competing interests.
: The study procedure was approved by the Institutional Review Board of the Faculty of Social Sciences at Radboud University (protocol number ECSW-2018-086, Stoltz et al., ). The study was in conducted compliance with the ethical standards of our institution.
: The participating school formally requested the KLS project in 2010 to gain insight into students’ social and emotional problems. The school requested parental permission at the beginning of each school year for all examinations and studies, including the KLS project. Parents were informed about the purpose and procedures of the study and could exclude their child from participation. Adolescents provided consent at the beginning of each survey.