female human 6,811 male 6,075 Humans 5,260 adult 4,810 Female 4,492 Male 3,813 Article 3,061 controlled study 2,881 Adult 2,500 major clinical study 2,125 middle aged 2,042 Middle Aged 1,753 article 1,749 aged 1,604 young adult 1,572 adolescent 1,458 Young Adult 1,423 Adolescent 1,270 child 1,245 human experiment 1,191 clinical article 1,099 Aged 1,086 physiology 977 procedures 928 psychology 925 Child 916 questionnaire 735 diagnostic imaging 733 cross-sectional study 713