Waist-to-height ratio
Encyclopedia
The waist-to-height ratio (WHtR) of a person is defined as the person's waist
Waist
The waist is the part of the abdomen between the rib cage and hips. On proportionate people, the waist is the narrowest part of the torso....

 circumference, divided by the person's height. The WHtR is a measure of the distribution of body fat. Higher values of WHtR indicate higher risk of obesity-related cardiovascular diseases; it is correlated with abdominal obesity
Abdominal obesity
Abdominal obesity, colloquially known as belly fat or clinically as central obesity, is the accumulation of abdominal fat resulting in an increase in waist size...

.

The WHtR should not be confused with the Waist–hip ratio (WHR), which has also been used to measure body fat distribution.

A 2010 study that followed 11,000 subjects for up to eight years concluded that WHtR is a much better measure of the risk of heart attack, stroke or death than the more widely used body mass index
Body mass index
The body mass index , or Quetelet index, is a heuristic proxy for human body fat based on an individual's weight and height. BMI does not actually measure the percentage of body fat. It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing...

.

For people under 40, a WHtR of over 0.5 is critical; for people in the age group between 40 and 50 the critical value is between 0.5 and 0.6, and for people over 50 the critical values start at 0.6.
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