Table 6. Results of secondary post hoc analyses exploring potential relationships between trait impulsivity and all the remaining striatal subdivisions.

Region of Interest	Variables		Estimate (β)	t-value	p-value†
Pre-Commissural Putamen
	Independent:
		Trait Impulsivity—SSP	-0.05	-0.58	.56
	Covariates:
		Age	-0.21	-2.34	.02
		Total Brain Volume	0.48	5.21	>.0001
Pre-Commissural Caudate
	Independent:
		Trait Impulsivity—SSP	-0.20	-2.15	.03
	Covariates:
		Age	-0.34	-3.66	.0004
		Total Brain Volume	0.33	3.60	.0005
Post-Commissural Caudate
	Independent:
		Trait Impulsivity—SSP	-0.10	-1.18	0.24
	Covariates:
		Age	-0.49	-5.82	>.0001
		Total Brain Volume	0.34	3.95	.0002

^†Results are reported as two-tailed tests.