Figure 1.

Trial profile. Np, number of participants (school pupils). No schools withdrew from the study, so all randomised units are present at baseline and at both follow-up assessments. Percentages for proportions of children with each measurement at baseline and at follow-ups are of total number of children who were pupils in randomised schools at baseline. Not all pupils with follow-up measures necessarily had data on the same measure at baseline (or vice versa), because of different pupils being absent at baseline and follow-up assessments at each time point, and because of pupils leaving or moving between schools. In all analyses, study participants were analysed in the group (intervention or control) to which they were randomised.