human 60 Humans 55 female 45 male 42 Female 38 Male 33 adult 28 statistical model 22 Adult 21 child 20 cross-sectional study 19 questionnaire 19 Child 17 controlled study 17 Article 16 Cross-Sectional Studies 15 adolescent 14 major clinical study 14 psychology 14 Logistic Models 13 Surveys and Questionnaires 13 Adolescent 12 Child, Preschool 12 educational status 12 middle aged 12 preschool child 12 statistics and numerical data 12 Socioeconomic Factors 11 United States 11 education 11