Table 2 Differences between DXA, DLW and bioimpedance methods for the assessment of body composition at baseline in overweight and obese initially lactating women postpartum

From: Body composition in overweight and obese women postpartum: bioimpedance methods validated by dual energy X-ray absorptiometry and doubly labeled water

  n kg P1 LoA KCC rP BA rP P2
FM DXA-BIS 67 3.1±2.8 <0.001 −2.5–8.7 0.76 0.91 0.01 0.95
FM DXA-MFBIA 52 8.0±4.2 <0.001 0.4–16.8 0.71 0.87 −0.25 0.08
SMM DXA-BIS 67 −0.3±1.5 0.14 −3.3–2.6 0.62 0.81 −0.05 0.69
TBW DLW- BIS 64 −2.1±1.9 <0.001 −5.9–1.7 0.69 0.88 −0.26 0.04
TBW DLW-MFBIA 49 −4.4±3.2 <0.001 −10.8–2.0 0.57 0.68 −0.21 0.15
TBW DLW-BIS073 64 −1.6±2.4 <0.001 −6.4–3.2 0.67 0.87 0.24 0.06
TBW DLW-MFBIA073 49 −5.1±3.1 <0.001 −11.3–1.1 0.59 0.71 0.24 0.09
TBW DLW-DXA073 68 1.2±1.5 <0.001 −1.8–4.2 0.73 0.92 0.19 0.12
  1. Abbreviations: BIS, bioimpedance spectroscopy; DLW, doubly labeled water; DXA, dual X-ray absorptiometry; FM, fat mass; SMM, skeletal muscle mass; TBW, total body water; Data presented as mean kg±s.d., with±2 s.d. limits of agreement (LoA).
  2. KCC, Kendall's concordance correlation, P<0.01 for all.
  3. rP=Pearson's correlation.
  4. P1=by paired t-test.
  5. P2=by linear regression.
  6. BA, Bland–Altman regression for systematic bias expressed as rPearson with P-values.
  7. For the linear regression differences between reference method and secondary methods vs the mean of both methods.