Fig. 2

Participant flow Diagram. Note: All students in the eligible classes were offered the training, irrespective of whether they had parental consent to participate in the research or whether they completed the baseline questionnaire. 520 students completed the baseline questionnaire. 66 % of these participants went on to complete both the training and the post-training questionnaire. 253 students (49 % of baseline) completed the follow-up questionnaire 3-months after training. 12 students responded to more than 50 % but less than 100 % of the questionnaire. Participants who did not complete the post-training or follow-up questionnaires were included in the analyses using multiple imputation estimates