title: Predictive equations for body fat and abdominal fat with DXA and MRI as reference in Asian Indians.
abstract: OBJECTIVE
  To develop accurate and reliable equations from simple anthropometric parameters that would predict percentage of total body fat (%BF), total abdominal fat (TAF), subcutaneous abdominal adipose tissue (SCAT), and intra-abdominal adipose tissue (IAAT) with a fair degree of accuracy.
  
  
  METHODS
  Anthropometry, %BF by dual-energy X-ray absorptiometry (DXA) in 171 healthy subjects (95 men and 76 women) and TAF, IAAT, and SCAT by single slice magnetic resonance imaging (MRI) at L3-4 intervertebral level in 100 healthy subjects were measured. Mean age and BMI were 32.2 years and 22.9 kg/m(2), respectively. Multiple regression analysis was used on the training data set (70%) to develop equations, by taking anthropometric and demographic variables as potential predictors. Predicted equations were applied on validation data set (30%).
  
  
  RESULTS
  Multiple regression analysis revealed the best equation for predicting %BF to be: %BF = 42.42 + 0.003 x age (years) + 7.04 x gender (M = 1, F = 2) + 0.42 x triceps skinfold (mm) + 0.29 x waist circumference (cm) + 0.22 [corrected] x weight (kg) - 0.42 x height (cm) (R (2) = 86.4%). The most precise predictive equation for estimating IAAT was: IAAT (mm(2)) = -238.7 + 16.9 x age (years) + 934.18 x gender (M = 1, F = 2) + 578.09 x BMI (kg/m(2)) - 441.06 x hip circumference (cm) + 434.2 x waist circumference (cm) (R (2) = 52.1%). SCAT was best predicted by: SCAT (mm(2)) = -49,376.4 - 17.15 x age (years) + 1,016.5 x gender (M = 1, F = 2) +783.3 x BMI (kg/m(2)) + 466 x hip circumference (cm) (R (2) = 67.1).
  
  
  CONCLUSIONS
  We present predictive equations to quantify body fat and abdominal adipose tissue sub-compartments in healthy Asian Indians. These equations could be used for clinical and research purposes.
authors.affiliation: Department of Medicine, Maulana Azad Medical College, New Delhi, India.
authors.forename: Kashish
authors.initials: K
authors.lastname: Goel
authors.forename: Nidhi
authors.initials: N
authors.lastname: Gupta
authors.forename: Anoop
authors.initials: A
authors.lastname: Misra
authors.forename: Pawan
authors.initials: P
authors.lastname: Poddar
authors.forename: Ravindra M
authors.initials: RM
authors.lastname: Pandey
authors.forename: Naval K
authors.initials: NK
authors.lastname: Vikram
authors.forename: Jasjeet S
authors.initials: JS
authors.lastname: Wasir
mesh_terms: D050153:Abdominal Fat / Q000473:pathology*; D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007194:India / Q000208:ethnology; D050152:Intra-Abdominal Fat / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D012044:Regression Analysis; D050151:Subcutaneous Fat / Q000473:pathology