title: Value of body mass index in the diagnosis of obesity according to DEXA in well-controlled RA patients.
abstract: BACKGROUND
  Rheumatoid arthritis (RA) has an indirect effect on body composition. Body mass index (BMI) is not a valid predictor of body fat in RA patients.
  
  
  OBJECTIVE
  To evaluate the accuracy of BMI in identifying obesity diagnosed according to dual energy X-ray absorptiometry (DXA) in well-controlled RA patients.
  
  
  METHODS
  An observational, cross-sectional, descriptive, analytical study. We used 3 different cutoffs for obesity as determined by DXA: >35% total fat, >40% total fat, and >35% central fat mass (central obesity).
  
  
  RESULTS
  One hundred one patients were included. We found that 35% total fat corresponded to a BMI of 24kg/m2, with a sensitivity of 90% and specificity of 75% (area under the curve [AUC] 0.917); 40% total fat to a BMI of 25kg/m2, with a sensitivity of 86% and specificity of 39% (AUC 0.822); and 35% central fat mass to a BMI of 22kg/m2, with a sensitivity of 97% and specificity of 84% (AUC 0.951).
  
  
  CONCLUSIONS
  Obesity according to DXA was underdiagnosed when the classic BMI cutoffs were used in well-controlled RA patients.
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México.
authors.forename: Nina
authors.initials: N
authors.lastname: Tello-Winniczuk
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México.
authors.forename: David
authors.initials: D
authors.lastname: Vega-Morales
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México.
authors.forename: Pedro A
authors.initials: PA
authors.lastname: García-Hernandez
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México.
authors.forename: Jorge A
authors.initials: JA
authors.lastname: Esquivel-Valerio
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México.
authors.forename: Mario A
authors.initials: MA
authors.lastname: Garza-Elizondo
authors.affiliation: Servicio de Reumatología, Departamento de Medicina Interna, Hospital Universitario Dr. José Eleuterio GonzálezMonterrey (Nuevo León), México. Electronic address: ana.aranag@gmail.com.
authors.forename: Ana C
authors.initials: AC
authors.lastname: Arana-Guajardo
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications*; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications / Q000175:diagnosis*; D012680:Sensitivity and Specificity
keywords: Absorciometría dual por rayos X; Artritis reumatoide; Body mass index; Diagnosis; Diagnóstico; Dual energy X-ray absorptiometry; Obesidad; Obesity; Rheumatoid arthritis; Índice de masa corporal