Fig 4. Relationships between 11 body condition indices (BCIs) and residual fat, a measure of true body condition, for each sex.

Variation in each BCI that can be explained by residual fat is provided as an r² value. Ideally, most variation in a BCI should be attributable to variation in true body condition, and there should be a positive linear relationship between the BCI and true body condition. Descriptions of each BCI are provided in Table 1.