Figure 1

Distribution of cardiovascular fitness level within each body mass index level. Data presented as percentage and standard error (SE). Cardiovascular 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 20^th percentile of the same sex and age group, moderate between the 20^th and 59^th percentiles, and high at or above the 60^th percentile. Cut-points used to define weight status by body mass index (BMI, kg/m²) level are: normal weight <25; overweight > 25 <30; and, obese > 30.