human 392 female 295 male 293 Humans 286 child 264 school child 179 Female 177 Male 173 Article 168 adolescent 166 Child 164 major clinical study 157 controlled study 155 adult 129 article 126 Adolescent 125 preschool child 85 school 84 questionnaire 83 human experiment 82 psychology 80 Schools 79 clinical article 67 education 63 Child, Preschool 54 young adult 50 Adult 49 Surveys and Questionnaires 47 United States 47 cross-sectional study 46