Table 1—

Baseline demographic and metabolic characteristics: all subjects combined and by ethnic and sex groups

Total populationCaucasianAfrican AmericanMaleFemale
n3218141418
Age (years)16.0 ± 1.616.1 ± 1.315.9 ± 2.015.9 ± 1.516.1 ± 1.8
Tanner stage4.8 ± 0.54.8 ± 0.54.9 ± 0.34.9 ± 0.44.8 ± 0.5
Weight-for-height percentile66.2 ± 32.157.4 ± 37.177.3 ± 20.460.1 ± 31.070.8 ± 33.0
Total fat mass (kg)23.4 ± 15.522.2 ± 15.824.9 ± 15.615.8 ± 15.029.3 ± 13.5*
% Fat29.5 ± 14.230.0 ± 13.728.9 ± 15.419.7 ± 12.437.5 ± 10.1*
Total FFM (kg)45.7 ± 12.145.6 ± 10.545.8 ± 14.354.1 ± 8.739.2 ± 10.3*
REE (kcal/day)1,565 ± 2531,602 ± 3091,524 ± 1711,688 ± 2831,471 ± 185*
SI (×10−4 · min−1/μIU/ml)3.41 ± 1.873.46 ± 2.153.36 ± 1.493.77 ± 2.123.12 ± 1.65
Kg (%/min)2.15 ± 1.211.83 ± 0.872.57 ± 1.471.63 ± 0.672.56 ± 1.38*
  • Data are means ± SD.

  • * Significantly different between male and female subjects (P < 0.05).