Reliability: Cohen’s kappa with 90% CI. Intertest agreement among BMI & WC (0.61). Agreements between BMI SKF & FFM index, WC to SKF & FFM and SKF to FFM (<0.6)
BIA & WC feasible measures. Lack of reliability and large noncompliance for both SKF () and FFMI (BIA) ().
Slaughter et al. [29]; Durnin and Womersley [26]; Johnston et al. [30]; Brook [31]
ADP
Validity: Slaughter et al. [29] ( ()); mean difference = 0.69; 95% CI = 25.8; Durnin and Womersley [26] ( ()); mean difference = 2.34; 95% CI = 18.0; Johnston et al. [30] ( ()); mean difference = 2.73; 95% CI = 19.6; Brook ( ()); mean difference = −2.45; 95% CI = 22.3
Slaughter’s equation most accurate despite wide LOA. Other equations displayed substantial intermethods difference and under- or overestimation of % BF.
ID: intellectual disability; DS: Down syndrome; AGM: anthropometric girth measurements; SKF: skinfold; BIA: bioelectrical impedance analysis, ADP: air displacement plethysmography; WC: waist circumference; FFMI (BIA): fat-free mass index derived by bioelectrical impedance analysis; %BF: percent body fat; ICC: intraclass correlation coefficients; CI: confidence interval; : coefficient of correlation; LOA: limits of agreement.