Table III.
Overall error of predicted percentage body fat: original and corrected Slaughter equations
| Difference (predicted percentage body fat-DXA percentage body fat)a |
||||
|---|---|---|---|---|
| Original Slaughter equations |
CP corrected Slaughter equations |
|||
| Mean (SD)b | 95% CI | Mean (SD)b | 95% CI | |
| Overall | −9.6 (6.2) | (−11.0 to −8.1) | 0.2 (4.8) | (−1.0 to 1.3) |
| Sex | ||||
| Male | −8.0 (5.9) | (−9.8 to −6.1) | −0.1 (4.4) | (−1.5 to 1.3) |
| Female | −11.8 (6.0) | (−14.0 to −9.5) | 0.5 (5.3) | (−1.5 to 2.5) |
| Race | ||||
| White | −10.1 (6.5) | (−11.9 to −8.2) | 0.1 (5.1) | (−1.3 to 1.5) |
| Black | −8.3 (5.2) | (−10.8 to −5.8) | 0.3 (3.9) | (−1.6 to 2.2) |
| GMFCS category | ||||
| Less severe | −5.7 (5.4) | (−8.4 to −3.0) | −0.1 (5.1) | (−2.6 to 2.5) |
| More severe | −10.9 (5.9) | (−12.5 to −9.3) | 0.2 (4.8) | (−1.1 to 1.6) |
| Tanner stage | ||||
| 1, 2 (Prepubescent) | −10.8 (7.3) | (−14.3 to −7.2) | −0.0 (5.4) | (−2.6 to 2.6) |
| 3 (Pubescent) | −11.6 (7.2) | (−16.2 to −7.0) | −0.0 (5.7) | (−3.6 to 3.6) |
| 4, 5 (Postpubescent) | −7.9 (5.3) | (−9.7 to −6.0) | −0.1 (4.4) | (−1.6 to 1.5) |
| Triceps+subscapular skinfold | ||||
| ≤35mm | −10.2 (6.2) | (−11.8 to −8.5) | 0.3 (4.6) | (−0.9 to 1.5) |
| >35mm | −7.3 (5.9) | (−10.5 to −4.1) | −0.3 (5.5) | (−3.4 to 2.7) |
a
Individual difference between equation-predicted percentage body fat and DXA percentage body fat.
b
The mean difference provides an estimate of the bias (systematic error) of the equation-predicted percentage body fat, whereas the SD of this difference provides a measure of the precision of the prediction. DXA, dual energy X-ray absorptiometry; GMFCS, Gross Motor Function Classification System.