male human 340 female 317 adult 250 Humans 248 Male 222 Female 193 controlled study 192 Article 185 major clinical study 118 Adult 111 middle aged 106 article 91 aged 89 Middle Aged 85 adolescent 81 young adult 73 Adolescent 65 Young Adult 65 human experiment 57 physiology 57 procedures 57 Aged 56 child 55 psychology 54 clinical article 53 nonhuman 51 cross-sectional study 45 diagnostic imaging 44 questionnaire 43