The intervention conditions were delivered via a combination of printed forms with paper-and-pencil exercises and face-to-face sessions. All experimental conditions included an initial session (completing the forms individually in the groups + face-to-face component) and sets of handouts for three following weeks. The face-to-face component was delivered within three days of completing the initial forms. The initial session was followed by a booster session (group + face-to-face components), delivered at 2-month follow-up. Across the groups, completing the forms (individual component) took approximately 30 minutes and was conducted in classrooms. The face-to-face components took 45-60 minutes and were conducted in the offices of school nurses or school psychologists.