Figure 1

Flow of schools and participants through study. * difference in time to follow-up 1 between control and intervention schools was the result of the scheduling of the Christmas school holidays which meant the first data collection could not occur. These time differences are accounted for with the analysis procedures undertaken. ‡ pupils in year 5 at baseline had moved on to senior schools at post-intervention follow-up. § one senior school would not allow access (n = 30).