title: Application of body mass index adjusted for fat mass (BMIfat) obtained by bioelectrical impedance in adults.
abstract: BACKGROUND
  Body mass index (BMI) has been one of the methods most frequently used for diagnose obesity, but it isn't consider body composition.
  
  
  OBJECTIVE
  This study intends to apply one new adiposity index, the BMI adjusted for fat mass (BMIfat) developed by Mialich et al. (2011), in a adult Brazilian sample.
  
  
  METHODS
  A cross-sectional study with 501 individuals of both genders (366 women, 135 men) aged 17 to 38 years and mean age was 20.4 ± 2.8 years, mean weight 63.0 ± 13.5 kg, mean height 166.9 ± 9.0 cm, and BMI 22.4 ± 3.4 kg/m2.
  
  
  CONCLUSIONS
  High and satisfactory R2 values were obtained, i.e., 91.1%, 91.9% and 88.8% for the sample as a whole and for men and women, respectively. Considering this BMIfat were developed new ranges, as follows: 1.35 to 1.65 (nutritional risk for malnutrition), > 1.65 and ≤2.0 (normal weight) and > 2.0 (obesity). The BMIfat had a more accurate capacity of detecting obese individuals (0.980. 0.993, 0.974) considering the sample as a whole and women and men, respectively, compared to the traditional BMI (0.932, 0.956, 0.95). Were also defined new cut-off points for the traditional BMI for the classification of obesity, i.e.: 25.24 kg/m2 and 28.38 kg/m2 for men and women, respectively.
  
  
  CONCLUSIONS
  The BMIfat was applied for the present population and can be adopted in clinical practice. Further studies are needed to determine its application to different ethnic groups and to compare this index to others previously described in the scientific literature.
authors.affiliation: Post-doctoral Student. Department of Internal Medicine. Faculty of Medicine of Ribeirao Preto. University of Sao Paulo. Ribeirao Preto. SP. Brazil.. mirelemialich@yahoo.com.br.
authors.forename: Mirele Savegnago
authors.initials: MS
authors.lastname: Mialich
authors.affiliation: Professor. Department of Social Medicine. Faculty of Medicine of Ribeirao Preto. University of Sao Paulo. Ribeirao Preto. SP. Brazil..
authors.forename: Edson Zangiacomi
authors.initials: EZ
authors.lastname: Martinez
authors.affiliation: Professor. Department of Internal Medicine. Faculty of Medicine of Ribeirao Preto. University of Sao Paulo. Ribeirao Preto. SP. Brazil..
authors.forename: Alceu Afonso
authors.initials: AA
authors.lastname: Jordão Junior
mesh_terms: D000273:Adipose Tissue; D000293:Adolescent; D000328:Adult; D015992:Body Mass Index; D001837:Body Weights and Measures / Q000379:methods; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000175:diagnosis*; D055815:Young Adult