severity of illness index Severity of Illness Index 113 Humans 112 human 112 female 90 male 89 Female 88 Male 86 adult 71 middle aged 62 Middle Aged 61 Adult 59 Article 55 controlled study 48 major clinical study 42 disease severity 41 aged 37 Aged 34 adolescent 29 Adolescent 28 complication 27 risk factor 25 Young Adult 24 young adult 24 pathophysiology 22 pathology 20 Risk Factors 19 cross-sectional study 19 psychology 19 treatment outcome 19