The NHANES obtains measured weights in an examination gown and heights without shoes. BMI is calculated by dividing weight in kilograms by the square of height in meters. Children and adolescents with a BMI at or above the sex-and age-specific 95th percentile based on the 2000 CDC growth charts are considered obese.
The original baseline was revised from 16.1 to 16.2 due to a change in the methodology. Obesity was originally coded based on the calculated BMI variable which is rounded in NHANES. To be consistent with NHANES reports, instead of using the calculated BMI variable, BMI is now computed directly from the weight and height variables. The target was proportionately adjusted from 14.6 to 14.5 based on the origianl target setting method.