Adolescent Humans 71 adolescent 71 human 71 female 61 male 58 Female 57 Male 52 adult 46 Adult 42 Young Adult 36 young adult 36 Child 35 child 35 middle aged 33 Middle Aged 32 controlled study 30 Article 29 major clinical study 28 Aged 21 aged 21 United States 18 preschool child 16 questionnaire 16 Child, Preschool 15 article 15 psychology 15 procedures 14 risk factor 13 statistics and numerical data 12