Adult Humans 189 adult 189 human 189 female 177 Female 173 male 165 Male 161 middle aged 124 Middle Aged 123 controlled study 82 Article 78 aged 76 Aged 73 young adult 70 Young Adult 69 major clinical study 64 Severity of Illness Index 59 severity of illness index 59 adolescent 50 body mass 50 Adolescent 49 Body Mass Index 43 cross-sectional study 39 psychology 38 risk factor 37 Cross-Sectional Studies 35 complication 33 Periodontal Index 31 periodontal index 31