Participants
WEST
Two urban schools in the West of the Netherlands participated in this study with a total of 20 classes. All students in these 20 classes were asked to participate in the study (n = 553), with no exclusion criteria to allow stronger generalizability of findings. Parents of eligible students received a flyer and additional information about the study. A sample of 439 students (79%) decided to participate, with both parents and students giving active informed consent, of which 426 students returned the T0 questionnaire.T3 data were available for 289 students (68% of 