Obesity is based on the body mass index, a calculation using height and weight.

肥胖是根据身体质量指数，用身高和体重计算出来的结果。

youdao

Using about 20 years of height and weight data (to determine body mass index) from two large national surveys for the U.S. and the U.K., researchers made forecasts.In the U.S.

通过20年两次的对美英两国国人身高和体重数据（决定了身体重量的指数）的调查，研究人员做出了这样的预测。

youdao

Obesity is calculated using the Body Mass Index (BMI), a ratio of weight in comparison to height.

肥胖程度是以身体质量指数(BMI)来衡量的，身体质量指数即体重与身高的比。

youdao

Body mass index,or BMI, is a measure of a person's weight in relation to height.

VOA: special.2011.02.15

They measured height, weight and body mass index - calculated by dividing weight in kilograms by the square of your height in metres.

BBC: Curvier women 'will live longer'

The studies measured the participants' body mass index (BMI), a ratio of their height and weight, but it wasn't able to take into account their body fat composition, or how much of their overall body weight was made up of fat versus muscle.

CNN: Obesity paradox: Why being thin with diabetes is dangerous

All models were required to have a body mass index -- a ratio of height and weight -- above 18, the minimum limit considered healthy by the World Health Organization.

CNN: Young models dying to be skinny