The intervention targeted two teachers in each school, although the numbers of teachers and students and school sizes were significantly different among schools. Further study weighting the number of students, teachers, school settings and other school-based characteristics is necessary to quantify the improvement in schools (Inchley et al., 2006; Muennig and Woolf, 2007; Yoshimura et al., 2009; Saab and Klinger, 2010). In addition, analysis of the enrollment rate of schools and the exact number of migrant children could be included in a further study.