FIGURE 1.

Values are based on the 626 boys and 570 girls in the Pediatric Rosetta Body Composition Project. A: Relation of DXA-determined PBF (PBF_DXA) with PBF calculated from the Slaughter equations (PBF_Slaughter). Data points represent the individual children, the dashed line is the line of identity (PBF_DXA = PBF_Slaughter), and the solid line is the smoothed (Lowess) curve. B: Bland-Altman plot for the agreement between PBF_DXA and PBF_Slaughter. Data points represent the individual children, and the black line is the Lowess curve. Overall medians are represented by the large diamonds, and the dashed lines represent the 95% CIs for the agreement between the 2 methods. C: Relation of SF sum to percentage body fat. Based on the Slaughter equations, all estimates of PBF for children with an SF sum ≥35 mm would fall on straight lines, with slopes of 0.783 (boys) and 0.546 (girls). The data points represent the DXA-calculated body fatness of each child, and the dashed lines represent the Lowess-estimated association between SF sum and PBF_DXA. Among boys, the discrepancies between PBF_DXA and PBF_Slaughter increase substantially at higher SF sum levels. The large circle represents a boy with an SF sum of 84 mm (first row of Table 3). DXA, dual-energy X-ray absorptiometry; Lowess, locally weighted scatter plot smoothing; PBF, percentage body fat; PBF_DXA, percentage body fat estimated by using dual-energy X-ray absorptiometry; PBF_Slaughter, percentage body fat estimated by using the Slaughter skinfold-thickness equations; SF sum, sum of subscapular and triceps skinfold thicknesses.