human 221 Humans 174 female 162 male 153 Female 116 adult 111 Male 105 article 73 questionnaire 72 controlled study 70 education 66 Adult 64 cross-sectional study 57 major clinical study 56 child 55 human experiment 49 Surveys and Questionnaires 47 middle aged 47 Article 46 Child 46 Cross-Sectional Studies 46 Middle Aged 43 psychology 42 statistics and numerical data 40 young adult 39 adolescent 38 Adolescent 35 aged 34 Young Adult 32 United States 30