Fig. 1

Flow chart of inclusion of participants Note. ^a 280 schools in 29 school boards were initially eligible. 4 school boards encompassing 32 schools did not agree to participate and were therefore removed from the recruitment process. ^b If more than 100 teachers consent to participate, we will randomly select 100 teachers to participate in the trial. ^c Parents and students must provide informed consent for students to participate in the assessments. Students who do not participate in assessments will still participate in the Open Sky School program. ^d In the event that multiple teachers from the same school consent to participate, they will be allocated to the same experimental condition to avoid contamination effects