adult human 5,679 female 4,810 male 4,675 Humans 4,174 Adult 2,909 Female 2,872 Male 2,739 Article 2,697 controlled study 2,507 middle aged 1,987 major clinical study 1,771 article 1,705 Middle Aged 1,645 young adult 1,612 Young Adult 1,434 aged 1,335 adolescent 1,084 human experiment 1,070 clinical article 1,006 Adolescent 947 Aged 914 physiology 790 procedures 709 psychology 692 diagnostic imaging 620 questionnaire 580 child 577 cross-sectional study 558 retrospective study 525