human 120 Humans 86 article 79 expectation 79 adult 75 female 73 male 71 human experiment 40 Male 39 Adult 38 Female 37 major clinical study 33 controlled study 32 Article 29 young adult 27 psychology 24 Young Adult 23 adolescent 19 life expectancy 19 motivation 19 Adolescent 18 Motivation 18 perception 18 child 16 decision making 16 middle aged 16 questionnaire 16 Middle Aged 15 physiology 15 Expectations 14