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Table 3 Agreement data for predicted thoracic gas volume

From: Validity of new child-specific thoracic gas volume prediction equations for air-displacement plethysmography

  Regression Residual Plot
  R2 SEE r P Mean difference (95% CI)
European American
Girls      
TGV (adult) 0.56 0.37 -0.65 0.001 0.59 (-0.12;1.30)
TGV (child-specific) 0.61 0.35 -0.56 0.001 0.11 (-0.57;0.78)
Boys      
TGV (adult) 0.72 0.47 -0.59 0.01 0.32 (-0.58;1.22)
TGV (child-specific) 0.73 0.46 -0.50 0.05 0.06 (-0.83;0.94)
African American
Girls      
TGV (adult) 0.71 0.24 -0.06 0.78 0.71 (0.18;1.24)
TGV (child-specific) 0.73 0.23 -0.01 0.96 0.23 (-0.28;0.75)
Boys      
TGV (adult) 0.65 0.29 0.00 0.99 0.26 (-0.44;0.96)
TGV (child-specific) 0.67 0.29 -0.03 0.90 -0.02 (-0.67;0.64)
European
Girls      
TGV (adult) 0.64 0.42 -0.72 0.001 0.41 (-0.42;1.23)
TGV (child-specific) 0.76 0.35 -0.16 0.37 0.06 (-0.68;0.75)
Boys      
TGV (adult) 0.79 0.46 -0.81 0.001 -0.23 (-1.24;0.78)
TGV (child-specific) 0.80 0.46 -0.16 0.27 -0.22 (-1.15;0.71)
  1. TGV; Thoracic gas volume.
  2. TGV (adult); Thoracic gas volume predicted using the adult-based proprietary equations (developed using Crapo et al. prediction of functional residual capacity and tidal volume constants for males and females) [18].
  3. TGV (child-specific); Thoracic gas volume predicted using the child-specific equations of Fields et al. [16].
  4. Dependent variable is the measured TGV.
  5. r; The Pearson correlation coefficient between the regression residuals and the criterion; criterion is measured thoracic gas volume).
  6. P value indicates whether the r value is significant and estimation bias is present.
  7. SEE; Standard error of the estimate.
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