Funding for this research was provided by:
Education Endowment Foundation (2681)
Wellcome (203139/Z/16/Z, 2681, 204928/Z/16/Z, 218554/Z/19/Z, 100309/Z/12/Z)
Wellcome Trust (110027/Z/15/Z)
NIHR Oxford Biomedical Research Centre
NIHR Oxford Health Biomedical Research Centre
Elizabeth Casson Trust
Received: 24 November 2020
Accepted: 16 March 2021
First Online: 31 March 2021
: All schools were required to read and sign a memorandum of understanding. Participants and their parent(s)/guardian(s) were asked to read the information sheet and provide opt-out consent. Schools consented for their anonymised data to be published. Individuals who did not opt out of data collection and storage agreed for their anonymised data to be published. The trial has been granted ethical approval by the Central University Research Ethics Committee of Oxford University (Registration No. R48879/RE001). The trial’s secondary measures were retrospectively registered at ExternalRef removed on 18 September 2017 (ExternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.