Table 1.
For dietary intake, n = 461 and for all others, n = 462.
Table 2.
Mean comparisons of height, body mass and body composition by age group.
Values are mean ± SD. For height, weight and BMI, n = 297 (20–39 y), 90 (40–59 y) and 75 (≥ 60 y), and for fat-free mass (FFM), lean mass, fat mass, BF% measures, and android/gynoid ratio, n = 297 (20–39 y), 88 (40–59 y) and 71 (≥ 60 y).
Table 3.
Mean BF% according to BMI classification.
Values are mean ± SD with the percentage of each age group in parentheses. Body composition classification: underweight (< 18.5 kg/m2); normal weight (18.5–24.9 kg/m2); overweight (25.0–29.9 kg/m2); obese (≥ 30.0 kg/m2).
Table 4.
Pearson correlations of lean mass, fat mass, BF%, and BMI by age group.
Fig 1.
Percent of exact agreement between obesity defined by a BF% ≥ 25.0 and BMI.
The percent of exact agreement peaked at BMI’s of 25 and 26 kg/m2.
Table 5.
Prevalence and exact agreement of obesity defined by BMI and BF%.
Obesity: BMI ≥ 30.0; measured BF% ≥ 25.0. Ck, Cohen’s kappa coefficient.
Fig 2.
Comparison of percent misclassified as not obese for U.S. Navy and NHANES III stratified by age.
Applying the BMI cutoff of ≥ 30.0, chi-square tests between samples by age group showed proportionately fewer Navy volunteers were misclassified in the 40–59 year old group and for all age groups combined (P < 0.05). For Navy (n = 336) BF% was calculated from DXA measured compartments, and for NHANES III (n = 3243) bioelectrical impedance was used to estimate BF% [11].