Table 2.

Correlation between the volume of the portion of the right caudate where the voxel-based morphometry showed statistical difference in the concentration of grey matter and the clinical measures

Clinical measure	Coefficient correlation*	p value
DSM-IV-TR
Inattention	rho38 = −0.35	0.02
Hyperactivity	rho38 = −0.51	< 0.001
Impulsivity	rho38 = −0.37	< 0.001
FASCT, self-reported version
Hyperactivity	r38 = −0.32	0.04
Organization problems	r38 = −0.48	< 0.001
Low tolerance to frustration	r38 = −0.47	< 0.001
Total score	r38 = −0.49	< 0.001
FASCT, observer version
Hyperactivity	r38 = −0.31	0.05
Organization problems	r38 = −0.38	0.01
Low tolerance to frustration	r38 = −0.23	0.14
Legal problems	rho38 = −0.19	0.21
Total score	r38 = −0.39	0.01

DSM-IV-TR = Diagnostic and Statistical Manual of Mental Disorders, 4th edition, text revised; FASCT = Friederichsen, Almeida, Serrano, Cortes Test.²²

^*Calculated with the Spearman correlation coefficient (rho) and the Pearson correlation coefficient (r).