title: Adiposity assessments: agreement between dual-energy X-ray absorptiometry and anthropometric measures in U.S. children.
abstract: OBJECTIVE
  To evaluate performance of anthropometric measures relative to percentage body fat (%BF) measured by dual-energy X-ray absorptiometry in children.
  
  
  METHODS
  Data from 8 to 19-year-old U.S. children enrolled in a nationally representative cross-sectional survey in 2001-2004 (n = 5,355) with measured %BF, body mass index (BMI), waist circumference (WC), waist-to-height ratio (WHtR), and triceps skinfold thickness (TSF) were used. Agreement and prediction were evaluated based on standardized regression coefficients (β), kappa, and the area under the receiver-operating characteristic curves (AUC).
  
  
  RESULTS
  The association between Z-scores for %BF and anthropometric measures was strong (β of ∼0.75-0.90, kappa of ∼0.60-0.75, and AUC of ∼0.87-0.98; P < 0.001 for all), with only some variations by race-ethnicity, mostly in girls. In boys, TSF and WHtR Z-scores had stronger agreement with %BF than BMI (β of 0.91 and 0.86 vs. 0.79, kappa of 0.75 and 0.71 vs. 0.59, and AUC of 0.97 and 0.97 vs. 0.91; P < 0.05 for all). In boys with BMI < median but %BF ≥ median, β value of TSF Z-score was higher than those from BMI. In girls, TSF also provided a higher agreement than BMI, but was only statistically higher for kappa.
  
  
  CONCLUSIONS
  High agreement and small racial-ethnic variations in the association between %BF and anthropometric measures support the use of anthropometric measures, especially WHtR and TSF, as proxy indicators for adiposity.
authors.affiliation: Johns Hopkins Global Center on Childhood Obesity, Department of International Health Human Nutrition Program, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA; Alive & Thrive Project and Strategic Information, Family Health International (FHI) 360, Hanoi, Vietnam.
authors.forename: Nguyen T
authors.initials: NT
authors.lastname: Tuan
authors.forename: Youfa
authors.initials: Y
authors.lastname: Wang
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000378:metabolism; D050154:Adiposity / Q000502:physiology*; D000293:Adolescent; D019540:Area Under Curve; D001823:Body Composition; D001827:Body Height; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D009749:Nutrition Surveys; D009765:Obesity / Q000175:diagnosis*; D012372:ROC Curve; D012885:Skinfold Thickness; D014481:United States; D055105:Waist Circumference; D049629:Waist-Hip Ratio; D055815:Young Adult