Table 1. Participant demographics (n = 88, male).

	Age	Trait Impulsivity– SSP	Total Brain Volume	Post-Commissural Putamen Volume
Mean ±S.D.	28.16 ±3.34	50.84 ±9.29	1584685.86 ±101878.52	3781.23 ±372.50
Range:	21.32–34.96	29.48–78.85	1369636–1872065	2957–4751