Funding for this research was provided by:
Medical Research Council (MC-CF023241)
National Institute for Health Research (CDF 2014-07-020)
Public Health Agency (COM/4986/14)
Received: 18 April 2018
Accepted: 13 August 2019
First Online: 28 August 2019
Ethics approval and consent to participate
: This study is a separate analysis of the dataset collected for evaluation of Dead Cool, trial registration ISRCTN29351200 (retrospective). Full details of ethics and consent are available from the evaluation report [CitationRef removed]. Briefly, ethical approval has been granted by the School of Education Ethics Committee, Queen’s University Belfast. Participation in the study is by voluntary informed written consent (school principals, teachers, opt-out for parents followed by opt-in for students), obtained by the evaluation researchers prior to all stages of data collection.
: Not applicable.
: The authors declare that they have no competing interests.