human 5,867 adult 5,820 female 4,949 male 4,812 Humans 4,352 Female 3,001 Adult 2,916 Male 2,868 Article 2,714 controlled study 2,540 middle aged 1,997 major clinical study 1,782 young adult 1,760 article 1,727 Middle Aged 1,655 Young Adult 1,581 aged 1,370 adolescent 1,169 human experiment 1,084 Adolescent 1,032 clinical article 1,012 Aged 940 physiology 834 procedures 746 psychology 735 diagnostic imaging 640 child 607 questionnaire 598 cross-sectional study 577 retrospective study 532