Time Factors human Humans 226 time factor 224 female 163 Female 157 male 157 Male 151 adult 130 Adult 106 young adult 79 Young Adult 78 Middle Aged 74 controlled study 73 middle aged 73 Article 71 procedures 67 adolescent 64 Adolescent 63 physiology 50 aged 44 major clinical study 43 Aged 41 treatment outcome 37 Treatment Outcome 35 pathology 35 comparative study 33 article 32 randomized controlled trial 32 follow up 30