Adult Humans 237 adult 237 human 237 psychology female 217 Female 213 male 198 Male 193 middle aged 117 Middle Aged 116 young adult 111 Young Adult 109 adolescent 85 Adolescent 83 Article 72 controlled study 69 major clinical study 61 questionnaire 59 article 53 Surveys and Questionnaires 52 child 47 aged 41 Aged 38 Child 38 physiology 38 qualitative research 38 Qualitative Research 34 cross-sectional study 32 depression 32