Body mass index and Index number

Body mass index noun - A measure of someone's weight in relation to height; to calculate one's BMI, multiply one's weight in pounds and divide that by the square of one's height in inches; overweight is a BMI greater than 25; obese is a BMI greater than 30.

Index number and body mass index are semantically related. In some cases you can use "Index number" instead a noun phrase "Body mass index".

Index number noun - A number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time.

Body mass index and index number are semantically related. Sometimes you can replace phrase "Body mass index" with "Index number", this phrases are similar.