Table 4

Agreement data for percent fat derived using TGV prediction equations

Regression
 Residual Plot

R2
 SEE
 r
 P
 Mean difference(95%CI)
European American
Girls




%FAT(adult)
 0.97
 1.52
 0.07
 0.65
 2.5 (5.6;0.6)
%FAT (child-specific)
 0.98
 1.36
 0.25
 0.11
 0.3 (3.3;-2.6)
Boys




%FAT (adult)
 0.97
 1.84
 0.19
 0.44
 1.4 (5.2;-2.5)
%FAT (child-specific)
 0.98
 1.60
 0.27
 0.27
 0.1 (3.6;-3.3)
African American
Girls




%FAT (adult)
 0.98
 1.20
 -0.01
 0.78
 2.8 (5.2;0.5)
%FAT (child-specific)
 0.98
 1.11
 0.19
 0.38
 0.8 (3.1;-1.5)
Boys




%FAT (adult)
 0.99
 1.16
 -0.19
 0.42
 1.0 (3.3;-1.2)
%FAT (child-specific)
 0.99
 1.13
 -0.20
 0.41
 -0.1 (2.1;-2.4)
European
Girls




%FAT (adult)
 0.96
 1.09
 -0.00
 0.97
 1.7 (5.3;-2.0)
%FAT (child-specific)
 0.95
 1.24
 0.28
 0.11
 0.1 (2.5;-2.4)
Boys




%FAT (adult)
 0.95
 1.86
 0.22
 0.12
 -0.7 (3.0;-4.35)
%FAT (child-specific)
 0.98
 1.16
 0.04
 0.77
 -0.8 (2.4;-4.1)

%FAT; percent body fat by air-displacement plethysmography.

%FAT(adult); Percent body fat derived using thoracic gas volume predicted from adult-based proprietary equations (developed using Crapo et al. prediction of functional residual capacity and tidal volume constants for males and females) [18].

%FAT (child-specific); Percent body fat derived using thoracic gas volume predicted from child-specific equations by Fields et al. [16].

Dependent variable is percent body fat derived using measured thoracic gas volume.

r; The Pearson correlation coefficient between the regression residuals and the criterion; criterion is percent body fat from measured thoracic gas volume).

P value indicates if the r value is significant and hence, the presence of bias.

SEE; Standard error of the estimate.

Higgins et al. BMC Pediatrics 2006 6:18   doi:10.1186/1471-2431-6-18