According to the World Health Organization (WHO), Body Mass
Index (BMI) is a statistic that indicates the ratio of a person's
weight to their body volume. The Center for Disease Control (CDC)
uses the table to classify children from ages 2 to 20. Because BMI
values change as children grow, the CDC uses percentiles rather
than fixed values for BMI. Percentiles provide a basis of
comparison for BMI over time.
Weight status
Percentile range
Underweight
Less than the 5th percentile
Healthy weight
5th percentile to less than the 85th percentile
Overweight
85th to less than the 95th percentile
Obese
Equal to or greater than the 95th percentile
Based on data from WHO, a representative sample of 15-year-old
males could consist of the following 15 values.
18.1, 18.6, 15.9, 17.6, 21.9, 16.9, 20.8, 19.4, 21.3, 22.7, 19.0, 20.3, 19.8, 30.8, 24.3
85th percentile: