The

Table 1 Select descriptive characteristics for adults 20-49 years who completed a submaximal graded exercise test in the National Health and Nutrition Examination Survey, 1999-2002.

	Mean ± SE
Age (years)	33.5 ± 0.4
Estimated VO_2max (ml.kg^-1.min^-1)	41.7 ± 0.4
Body Mass Index (kg/m²)	26.5 ± 0.2
	Percentage ± SE
Sex*
Male	54.8 ± 1.5%
Female	45.2 ± 1.5%
Race/Ethnicity*
Mexican-American	6.4 ± 0.8%
Other Hispanic	5.9 ± 0.3%
Non-Hispanic White	76.4 ± 1.6%
Non-Hispanic Black	7.8 ± 0.9%
Other Race - Including Multi-Racial	3.5 ± 0.7%

Data presented as the mean or percent and standard error (SE). *Sex and race/ethnicity variables both sum to 100%.

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