Body Mass Index (BMI)is the medical standard for measuring the presence and degree of obesity. It is a ratio between height and weight that is associated with body fat and health risk.The higher your BMI, the greater your risk for certain medical conditions, such as heart disease, high blood pressure, type 2 diabetes, sleep apnea, and certain cancers.
BMI-Associated Disease Risk1
Clinical Guidelines on the Identification, Evaluation and Treatment of Overweight & Obesity in Adults - The Evidence Report Obes Res 1998,6(suppl 2). Extreme often referred to as Clinically Severe Obesity or Morbid Obesity