Table 4: Summary of predictive equations for children and adolescents published based on a four-compartmental model.

DevelopmentCross-validation
AuthorSex Ethnic group Age Y Method and criterion model RMSE CV (%)Equations and predictor variables Age PECV (%)CCCBiasAgreement
LimitsTrend

Slaughter et al. [47]MCauc and Black8–18*174UWW, Deut Dilut, SPA10.783.8%NA%FM = 0.735 * (Sum: Tric and Calf SKF > 35 mm) + 1.0NANANANANANANANANA
F1360.783.8%NA%FM = 0.610 * (Sum: Tric and Calf SKF > 35 mm) + 5.1NANANANANANANANANA

Leaner children and adolescentes (Sum: Tric + Sub SKF < 35 mm)

Slaughter et al. [47] MCaucPrepub50UWW, Deut Dilut, SPA10.803.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 1.7NANANANANANANANANA
Black0.803.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 3.5NANANANANANANANANA
CaucPub300.823.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 3.4NANANANANANANANANA
Black0.823.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 5.2NANANANANANANANANA
CaucPospub58
36
0.763.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 5.5NANANANANANANANANA
Black
0.763.6%NA%FM = 1.21 * (Sum: Tric and Sub SKF < 35 mm) − 0.008 * (Sum: Tric and Sub SKF < 35 mm)2  − 6.8NANANANANANANANANA
FCauc and Black136UWW, Deut Dilut, SPA10.803.9%NA%FM = 1.33 * (Sum: Tric and Sub SKF < 35 mm) − 0.013 * (Sum: Tric and Sub SKF < 35 mm)2  − 2.5NANANANANANANANANA

Fatter children and adolescentes (Sum: Tric + Sub SKF > 35 mm)

Slaughter et al. [47]MCauc and Black174UWW, Deut Dilut, SPA10.803.6NA%FM = 0.783 * (Sum: Tric and Sub SKF > 35 mm) + 1.6NANANANANANANANANA
F1360.803.9NA%FM = 0.546 * (Sum: Tric and Sub SKF > 35 mm) + 9.7NANANANANANANANANA

NA: not available; UWW: underwater weighing; DXA: dual-energy X-ray absorptiometry; Cauc: caucasians; SKF: skinfold; Tric: tricipital; Sub: subscapular; M: male; F: female; SPA: single photon absorptiometry; Deut Dilut: deuterium dilution; : coefficient of determination; RMSE: root of mean square error; CV: coefficient of variation; CCC: concordance correlation coefficient; PE: pure error; FM: fat mass; Prepub: prepubescent; Pub: pubescent; Postpub: postpubescent.
The authors used a sample aged 8–29 years but recommended the use of the proposed models for children and adolescents aged 8–18 years.
%FM = {(2.747/Db) (0.727 * TBW/ ) + (1.146 * BMC/ ) − 2.053 100, where Db body density; TBW: total body water; BMC: bone mineral content; : body weight [66].