Slaughter et al. ; Durnin and Womersley ; Johnston et al. ; Brook 
Validity: Slaughter et al.  ( ()); mean difference = 0.69; 95% CI = 25.8; Durnin and Womersley  ( ()); mean difference = 2.34; 95% CI = 18.0; Johnston et al.  ( ()); 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.
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