title: A specific bioelectrical impedance equation to predict body composition in Turner's syndrome.
abstract: BACKGROUND
  Cardiovascular disease is one of the main causes for Turner syndrome (TS) mortality and the evaluation of its risk factors such as excess body fat and its distribution is considered one of the major aspects of the adult patient care.
  
  
  OBJECTIVE
  To develop and validate a specific bioelectrical impedance analysis (BIA) equation to predict body composition in TS patients.
  
  
  METHODS
  Clinical and anthropometric data, dual-energy X-ray absorptiometry (DXA) for total fat-free mass (FFM) and BIA for resistance and reactance were obtained from 50 adult TS patients. Linear regression analysis was performed with multiple clinical and BIA data to obtain a predicting equation.
  
  
  RESULTS
  The equation developed to estimate FFM in adult TS patients showed great consistency with DXA, elevated correlation (r = 0.974) and determination (r(2) = 0.948) coefficients and an adequate standard error estimate (SEE = 1.52 kg).
  
  
  CONCLUSIONS
  The specific equation developed here allowed making an adequate FFM estimate in adult TS patients.
authors.affiliation: Departamento de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Alexis D
authors.initials: AD
authors.lastname: Guedes
authors.forename: Bianca
authors.initials: B
authors.lastname: Bianco
authors.forename: Mônica V N
authors.initials: MV
authors.lastname: Lipay
authors.forename: Emmanuela Q
authors.initials: EQ
authors.lastname: Callou
authors.forename: Marise L
authors.initials: ML
authors.lastname: Castro
authors.forename: Ieda T N
authors.initials: IT
authors.lastname: Verreschi
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods; D000328:Adult; D000886:Anthropometry; D001823:Body Composition / Q000502:physiology*; D017097:Electric Impedance; D005260:Female; D006801:Humans; D016014:Linear Models; D008875:Middle Aged; D011237:Predictive Value of Tests; D014424:Turner Syndrome / Q000235:genetics; D055815:Young Adult