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. 2008 Sep 15;5(4):A131.

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From a population of N = 10,122, nonpregnant adults aged ≥18 years were selected (N = 5,351). From that group, people who had data on all relevant covariates were selected (N = 4,417). From that subgroup, people who had accelerometer data that met the NHANES validity and reliability criteria and who wore the accelerometer for at least 4 days were selected (N = 3,348). Samples were taken from this group for regression analysis by waist circumference (N = 3,272) and by BMI (N = 3,250). — Participants from the National Health and Nutrition Examination Survey Selected for Study of Bouts^a and Nonbouts of Physical Activity, 2003–2004

Abbreviation: BMI, body mass index. ^a At least 10 consecutive minutes of moderate- to vigorous-intensity physical activity.