Fig. 2.

Number of days out of last ten school days that high-school students aged 12 to 17 years stayed in school for lunch, pre- and post-intervention, according to school (—▴—, experimental, n 129; —▪—, control, n 112); central Canada, September 2009 (pre) and May 2010 (post). Values are means with their standard errors represented by vertical bars