Tests of the assumptions of regression-based body condition indices for different size class groups.

Size groups were defined based on the fitted segmented regression model (Fig 2), which defined size groups as hatchlings to early juveniles (group 1, < 20.2 cm SVL), late juveniles to reproductive-sized adults (group 2, 20.2 cm to 30.0 cm SVL) and large adults (group 3, > 30.0 cm SVL). We tested three assumptions, whether 1) data are linear, 2) variance is constant (i.e., homoscedastic), and 3) frequency distribution of residuals is normal. Only p-values are reported.