title: Relationship between indices of obesity obtained by anthropometry and dual-energy X-ray absorptiometry: The Fourth and Fifth Korea National Health and Nutrition Examination Survey (KNHANES IV and V, 2008-2011).
abstract: BACKGROUND
  Body mass index (BMI), waist circumference (WC), and even dual-energy X-ray absorptiometry (DXA) are used for obesity diagnosis. However, it is not known which DXA-derived index of obesity correlates best with BMI and/or WC and it is not clear whether such an index is accurate or not.
  
  
  OBJECTIVE
  The aim of this study is to show the relationship between anthropometric measurements (BMI, WC) and body fat indices from DXA and to determine which DXA indices are strongly related to BMI and WC.
  
  
  METHODS
  This study was based on data obtained from the Fourth and Fifth Korea National Health and Nutrition Examination Survey (KNHANES IV-V). DXA measurements were performed on survey subjects over 10 years old from July 2008 through to May 2011. Of these, 18 198 individuals, aged 19 years and older for whom DXA data were available, were included.
  
  
  METHODS
  Weighted Pearson's correlated coefficients (r) were calculated among indices, according to sex, age group and menopause, and the coefficients were compared with each other.
  
  
  RESULTS
  BMI correlates most with trunk body fat mass in kg (r=0.831) and then with total body fat in kg (r=0.774, P<0.00043 for difference of r). In the older age group, BMI correlates with total body fat mass (r=0.822) better than with trunk fat mass (r=0.817, P<0.00043). WC correlates with trunk body fat mass most in both genders and all age groups (0.804≤r≤0.906). Correlations of BMI (r=0.645 for men, 0.689 for women) and WC (r=0.678 for men, 0.634 for women) to body fat percentages (%) were less robust than those to body fat mass.
  
  
  CONCLUSIONS
  BMI and WC reflect trunk and total body fat in kg more than body fat percentage derived by DXA.
authors.affiliation: Department of Family Medicine, Gachon University Gil Hospital, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 405-760, Republic of Korea. Electronic address: blueeva3@gmail.com.
authors.forename: Seul Gi
authors.initials: SG
authors.lastname: Kim
authors.affiliation: Department of Family Medicine, Gachon University Gil Hospital, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 405-760, Republic of Korea. Electronic address: highmove77@naver.com.
authors.forename: Ki dong
authors.initials: Kd
authors.lastname: Ko
authors.affiliation: Department of Family Medicine, Gachon University Gil Hospital, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 405-760, Republic of Korea. Electronic address: spfe0211@hanmail.net.
authors.forename: In Cheol
authors.initials: IC
authors.lastname: Hwang
authors.affiliation: Department of Family Medicine, Gachon University Gil Hospital, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 405-760, Republic of Korea. Electronic address: fmeye@hanmail.net.
authors.forename: Heuy Sun
authors.initials: HS
authors.lastname: Suh
authors.affiliation: The Boden Institute of Obesity, Nutrition Exercise & Eating Disorders, The University of Sydney, Medical Foundation Building K25, NSW 2006, Australia. Electronic address: shelley.kay@sydney.edu.au.
authors.forename: Shelley
authors.initials: S
authors.lastname: Kay
authors.affiliation: The Boden Institute of Obesity, Nutrition Exercise & Eating Disorders, The University of Sydney, Medical Foundation Building K25, NSW 2006, Australia. Electronic address: ian.caterson@sydney.edu.au.
authors.forename: Ian
authors.initials: I
authors.lastname: Caterson
authors.affiliation: Department of Family Medicine, Gachon University Gil Hospital, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 405-760, Republic of Korea. Electronic address: zaduplum@aim.com.
authors.forename: Kyoung Kon
authors.initials: KK
authors.lastname: Kim
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D000273:Adipose Tissue; D050154:Adiposity; D000328:Adult; D000886:Anthropometry; D001823:Body Composition; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D009765:Obesity / Q000175:diagnosis*; D056128:Obesity, Abdominal / Q000175:diagnosis; D056910:Republic of Korea; D060726:Torso; D055105:Waist Circumference; D055815:Young Adult
keywords: Adiposity; Body composition; Body mass index; Dual-energy X-ray absorptiometry; Waist circumference