High Quality Content by WIKIPEDIA articles! The Ponderal Index PI is a measure of leanness of a person calculated as a relationship between mass and height. It was first proposed 1921 as "Corpulence Index" by Rohrer. It is similar to the Body mass index, however the mass is normalized with the third power of body height rather than the second power. The body mass index (BMI), or Quetelet index, is a statistical measure which compares a person's weight and height. Though it does not actually measure the percentage of body fat, it is used to estimate a healthy body weight based on a person's height. Due to its ease of measurement and calculation, it is the most widely used diagnostic tool to identify weight problems within a population, usually whether individuals are underweight, overweight or obese. It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing "social physics". Body mass index is defined as the individual's body weight divided by the square of his or her height. The formulae universally used in medicine produce a unit of measure of kg/m2.

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