Table 2. Brain type boundaries based on the D score, calculated from the current sample and a previous population-based adult sample.

Brain type	Brain type boundary	Brain type boundarya
Extreme E	D<−0.23	D<−0.21
Type E	−0.23≤D<−0.053	−0.21≤D<−0.041
Type B	−0.053≤D<0.048	−0.041≤D<0.040
Type S	0.048≤D<0.277	0.040≤D<0.21
Extreme S	D≥0.277	D≥0.21

^aData from [29].