Table 1.
Descriptive statistics of body composition in boys (n = 408), including absolute and relative TEM of the dependent (DXA) and independent measures (maturation, body size, and skinfolds).
| Range | Mean | SD | TEM | TEM% | CI 95% | |
|---|---|---|---|---|---|---|
| DXA | ||||||
| Fat mass (kg) | 1.3–41.8 | 9.3 | 7.5 | 0.22 | 1.42 | 8.6–10.0 |
| Bone mineral content (kg) | 0.7–4.1 | 2.1 | 0.8 | 0.01 | 0.03 | 2.1–2.2 |
| Lean mass tissue (kg) | 17.1–72.6 | 38.1 | 12.7 | 0.06 | 0.15 | 36.9–39.4 |
| Age/maturation/anthropometrics | ||||||
| Age (year) | 8–18 | 13.7 | 2.99 | — | — | 12.9–13.5 |
| PHV (year) | −4.7–4.5 | −0.5 | 2.5 | — | — | −0.8–0.3 |
| Seating height (cm) | 61.5–99.5 | 82.3 | 8.8 | 0.26 | 0.30 | 81.4–83.1 |
| Height (cm) | 120.3–196.8 | 158.1 | 17.7 | 0.17 | 0.11 | 156.4–159.8 |
| Weight (kg) | 20.6–119.4 | 50.2 | 17.4 | 0.27 | 0.29 | 48.5–51.9 |
| Suprailiac skinfold (mm) | 2.8–64.5 | 13.3 | 10.2 | 0.35 | 2.27 | 12.4–14.3 |
| Horizontal abdominal skinfold (mm) | 1.5–66.0 | 16.5 | 12.0 | 1.59 | 4.96 | 15.4–17.7 |
TEM: absolute technical error of measurement; TEM%: relative technical error of measurement; CI: confidence interval; DXA: dual-energy X-ray absorptiometry; PHV: years for peak height velocity.