Participants
SECONDARY
All 205 public secondary schools in Wales were invited to participate in the research study. A total of 29 schools successfully took part in the trial. Figure CONSORT diagram demonstrating the flow of participants through each stage of the Randomised Controlled TrialThere were several reasons for schools not completing the planned programme delivery and data collection. These included the practicality of delivering the programme within 12 weeks, schools being unable to release teaching staff for training, and school closures during the Covid-19 pandemic. In total 860 males and 1066 females took part in the trial.A power analysis was conducted to determine the appropriate sample size for the research study (see [