Results of the distance-based significance tests of class attribution.

Standardised Effect Sizes (SES) between -2 and +2 correspond to non-significant differences. SES results ≤-2 (bolded values) indicate that the observed difference is larger than two times the standard deviation. These latter groupings are thus significantly aggregated and more similar than random NAC associations in the sample. SES values of ≥2 (italicised values) suggest the opposite relationship, suggesting substantial within-group variability. Macro-units associated with SES values greater than -2/+2 are marked with *.