Figure 1

Differences in baseline characteristics between control and intervention condition by socioeconomic level of school area. Differences in prevalence and confidence interval between control and intervention condition of baseline characteristics of the study sample, by socioeconomic level of the school area: the EU-Dap Study 2004-2006. A difference above zero means that the prevalence is higher among controls, below zero means that the prevalence is higher among students in the intervention arm.