"Waist measurement" refers to measuring the size of someone's waist. It is the distance around the narrowest part of your torso, usually between your hips and your ribcage. Full definition
Small for pets with waist measurements of 12 — 19 inches. (doggytoggery.com)
To investigate this effect in humans, Japanese scientists conducted a double - blind trial on obese adults with similar body weights and waist measurements in 2009. (health.com)
They also had smaller waist measurements, and were 33 % less likely to be overweight or obese. (health.com)