What does body mass index (BMI) correlate with?

Body mass index (BMI) is a numerical value derived from an individual’s height and weight, specifically calculated using the formula weight in kilograms divided by the square of height in meters. It serves as a useful screening tool to categorize individuals into various weight classes, such as underweight, normal weight, overweight, and obesity. The correlation of BMI with height and weight is particularly significant because it provides a quick and simplified metric to assess body fatness in relation to an individual's physical stature.

This relationship also allows for comparisons between different individuals and population groups, aiding in public health assessments and interventions focused on weight management. While BMI does not measure body fat directly, it is generally accepted that higher BMI values typically indicate greater body fat, making it a valuable tool in epidemiological studies and weight management strategies. Hence, the correct answer highlights the essential components that BMI directly correlates with: height and weight, which are foundational in the calculation of BMI and its relation to body fat.