Table 3:

USBD^a

Score Points	0	1	2
Interopercular opening (cm)	≥ 0.55	0.15–0.54	< 0.15
Height of insular cortex (cm)	≤ 1.25	1.26–1.74	≥ 1.75
Depth of cingulate sulcus (cm)	< 0.10	0.11–0.44	≥ 0.45

^aScore points from each structure add to a total score, which can range from a minimum of 0 points to a maximum of 6 points (a higher total score reflects a higher PMA).