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Table 2 Differences in major outcomes by body mass index level.

From: The "fit but fat" concept revisited: population-based estimates using NHANES

  Normal weight Overweight Obese
Age (mean years) 32.4 ± 0.8 34.4 ± 0.5 34.5 ± 0.9
Estimated VO2max (mean ml.kg-1.min-1) 42.9 ± 0.4* 41.8 ± 0.9* 38.7 ± 0.6
Fitness Level (percentage) †§    
Low 2.0 ± 0.5
(2,920,699)
4.3 ± 0.6
(6,188,369)
3.9 ± 0.5
(5,644,436)
Medium 12.9 ± 1.3
(18,451,215)
13.0 ± 1.1
(18,573,013)
7.6 ± 0.8
(10,819,591)
High 30.0 ± 2.3
(42,968,269)
17.4 ± 0.4
(24,868,929)
8.9 ± 1.0
(12,790,983)
  1. Data presented as the mean or percent and standard error (SE). Symbols for statistical significance: * = different from obese at p < 0.05; † = distribution of fitness level different across body mass index (BMI) groups. §The nine cells for fitness level by BMI level sum to 100% and represent the distribution across the population. The weighted sample size for each cell is indicated in parenthesis for the total analytic sample N = 143,225,503. Fitness level was categorized using sex and age-specific criteria for adults 20-49 yr. from the Aerobics Center Longitudinal Study, where low was defined as an estimated VO2max below the 20th percentile of the same sex and age group, moderate between the 20th and 59th percentiles, and high at or above the 60th percentile. Cut-points used to define weight status by BMI (kg/m2) level are: normal weight < 25; overweight > 25 < 30; and, obese > 30.