Schools human 75 Humans 73 school 69 female 55 male 52 Female 46 child 43 Male 41 Child 39 adolescent 37 Adolescent 36 psychology 25 controlled study 23 article 20 major clinical study 20 student 18 preschool child 17 Child, Preschool 16 Students 16 questionnaire 16 Surveys and Questionnaires 14 human experiment 13 Article 11 United States 11 adult 11 randomized controlled trial 10 Longitudinal Studies 9 longitudinal study 9 procedures 9