The health indicator obtained by dividing the height by cube root of weight is
Wait, BMI is kg/m². There's another index called the Ponderal Index, which is similar but uses the cube root. Let me check. The Ponderal Index formula is height divided by the cube root of weight. So that would be height / (weight)^(1/3). That matches the question's description. So the correct answer should be Ponderal Index.
Now, the other options. Let's think. BMI is definitely a distractor here. Then there's the Devine formula for ideal body weight, but that's not a ratio like this. Maybe options like BMI, Quetelet index (which is another name for BMI), and something else like Rohrer's Index. Rohrer's Index is weight divided by height cubed, multiplied by 100. So that's different.
So the options are likely A: BMI, B: Quetelet index, C: Ponderal index, D: Rohrer's index. The question states the correct answer is the Ponderal index. So the explanation would need to clarify each of these. The core concept is anthropometric indices. The correct answer is Ponderal Index because it's height divided by cube root of weight. The wrong options are other indices that use different formulas. The clinical pearl is to remember that BMI is weight/height², and Ponderal is height/(weight)^(1/3).
**Core Concept**
This question tests knowledge of anthropometric health indicators, specifically indices derived from weight and height measurements. The Ponderal Index (PI) is a key example, calculated as height divided by the cube root of weight. It is used to assess body composition in a manner similar to Body Mass Index (BMI).
**Why the Correct Answer is Right**
The Ponderal Index (also called Rohrer’s Index) is defined as **height (cm) / (weight in kg)^(1/3)**. It adjusts for body weight relative to height in a cubic relationship, making it more sensitive to body composition in certain populations (e.g., children, elderly). Unlike BMI, which uses height squared, the Ponderal Index’s cubic root accounts for three-dimensional body volume.
**Why Each Wrong Option is Incorrect**
**Option A:** Body Mass Index (BMI) is weight (kg)/height (m)², not involving a cube root.
**Option B:** Devine formula calculates ideal body weight, not a height/weight ratio.
**Option D:** Rohrer’s Index is an alternative term for Ponderal Index, but the question’s phrasing matches the standard definition of Ponderal Index directly.
**Clinical Pearl / High-Yield Fact**
Remember: **BMI = weight/height²**; **Ponderal Index = height/(weight)^(1/3)**. Confusion between these two indices is a common exam trap. Use BMI for general population screening, Ponderal Index for more nuanced assessments (e.g., pediatric growth).
**Correct Answer: C.