body_roundness_index: Body Roundness Index (BRI)

In cliot: Clinical Indices and Outcomes Tools

Body Roundness Index (BRI)

Description

Calculates the Body Roundness Index (BRI), a geometric measure of body composition that models the human body as an ellipse. BRI improves upon Body Mass Index (BMI) by quantifying the degree of central adiposity (visceral fat), which is a stronger predictor of metabolic syndrome, cardiovascular disease, and all-cause mortality.

Usage

body_roundness_index(waist_cm, height_cm)

Arguments

waist_cm	Numeric. Waist circumference in centimeters.
height_cm	Numeric. Height in centimeters.

Value

A list containing:

BRI_Score

The calculated Body Roundness Index. Scores range from 1 to roughly 20. Higher scores indicate greater central adiposity and a rounder body shape.

References

Thomas DM, Bredlau C, Bosy-Westphal A, et al. Relationships between body roundness with body fat and visceral adipose tissue emerging from a new geometric model. Obesity (Silver Spring). 2013;21(11):2264-2271. doi:10.1002/oby.20408

Examples

# Example 1: Average measurements
# Waist 85 cm, Height 175 cm
body_roundness_index(85, 175)

# Example 2: High central adiposity
# Waist 110 cm, Height 170 cm
body_roundness_index(110, 170)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.