title: Evaluation of the factorial method for determination of energy expenditure in 16 young adult women living in China.
abstract: OBJECTIVE
  The present study aimed to evaluate the accuracy of the factorial method for estimating energy needs in individuals living in China.
  
  
  METHODS
  Sixteen healthy female adults aged 22.1±1.2 years with a body mass index (kg/m(2)) of 20.4±1.7 were selected as subjects. In free-living conditions, energy expenditure (EE) was determined by using the factorial method. At the same time, the doubly labeled water method (DLW) was also used to measure energy expenditure of the subjects and served as the criterion method. EE predicted by the factorial method (EE(factorial)) was compared with the simultaneous measurement of EE by the validated DLW method (EE(DLW)).
  
  
  RESULTS
  There was excellent agreement between EE(factorial) (7.46±0.59 MJ/d) and EE(DLW) (7.64 ± 0.49 MJ/d), with a difference of -2.6±4.9% (-0.18±0.36 MJ/d). No significant differences were found between the two methods. EE(factorial) was highly correlated with EE(DLW) (r=0.795, P<0.001) and a good agreement for individuals was found by using the Bland and Altman test.
  
  
  CONCLUSIONS
  The factorial method gives satisfactory estimates of EE for both groups and individuals living in China.
authors: Key Laboratory of Laboratory Animal, Hebei Medical University, Hebei, China.
authors: JianMin
authors: J
authors: Liu
authors: JianHua
authors: J
authors: Piao
authors: Rui
authors: R
authors: Sun
authors: Ying
authors: Y
authors: Tian
authors: XiaoGuang
authors: X
authors: Yang
mesh_terms: D000328:Adult; D002681:China; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D009043:Motor Activity / Q000502:physiology*; D011865:Radioisotope Dilution Technique; D055815:Young Adult