human 109 principal component analysis 87 Humans 84 Principal component analysis 75 Article 65 controlled study 59 male 55 female 54 adult 45 article 38 Female 34 Male 33 nonhuman 29 procedures 26 Principal Component Analysis 23 major clinical study 23 Adult 20 Middle Aged 19 chemistry 19 middle aged 19 machine learning 18 Principal-component analysis 16 metabolism 16 questionnaire 15 China 14 aged 14 Animals 13 Quality control 13 child 13 genetics 13