Table 2. Clinical Characteristics of OCD Subjects and Healthy Controls.

Clinical characteristics	Healthy controls, n=22	OCD subjects, n=22
Y-BOCS	0	27 (5.0)
HAM-D	0 (0.7)	5 (4.2)
Lifetime history of tics	0	3
Age of initial OCD diagnosis	N/A	16.1 (6.9)
DSM-IV Axis I psychiatric comorbidity
No-current or past comorbidity	22	16
Current/past MDD	0/0	0/5
Current social phobia	0	1
Current panic disorder	0	1
Current tic disorder	0	1
Family history of OCD	0	6

Abbreviations: ASI, anxiety sensitivity index; HAM-D, Hamilton Depression Rating Scale; OCI-R, obsessive compulsive inventory; OCPD, obsessive compulsive personality disorder; Y-BOCS, Yale-Brown Obsessive Compulsive Score.

Clinical measures were performed in both OCD subjects and healthy controls. No OCD symptoms were noted in healthy controls as measured by the Y-BOCS. SDs are indicated in parentheses.