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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.