Waist - hip ratio is ratio of circumference of waist to that of hip and acceptable values are < 0.9 for men and < 0.85 for women. (md-health.com)
The olive oil group saw an increase of about one - third of an inch (0.85 cm), and the nut group only saw an increase in waist circumference of 0.14 inches (0.37 cm), the study authors reported. (health.com)
Which is to say that, for any circle (plane section of a sphere), a small change in radius would produce a corresponding change in circumference in a ratio of ~ 6.28. (dotearth.blogs.nytimes.com)