Humans human 85 male 57 female 55 Male 53 Female 51 child 36 Adolescent 34 adolescent 34 Child 31 adult 31 Adult 26 major clinical study 24 psychology 23 Middle Aged 19 middle aged 19 Article 18 questionnaire 18 Surveys and Questionnaires 17 Young Adult 16 preschool child 16 young adult 16 Schools 15 United States 15 controlled study 15 Child, Preschool 14 article 14 school 14 aged 12 metabolism 12