Table 1.

Demographic and clinical characteristics of the three samples

	OCD (n=489)	CC (n=298)	NCC (n=260)
Variable		Mean (SD); %(n)
Gender
Female	52.2% (255)	51.0% (152)	49.2% (128)
Male	47.9% (234)	49.0% (146)	50.8% (132)
Age (years)	12.39 (2.92)	13.01 (2.94)	13.26 (2.93)
Ethnicity
Asian American	3.1% (15)	0.3% (1)	0.0% (0)
Black American	0.8% (4)	0.7% (2)	1.5% (4)
Hispanic American	2.0% (10)	5.2% (15)	4.2% (11)
non-Hispanic White American	83.0% (406)	87.3% (260)	89.2% (232)
Other/not identified	11.1% (54)	6.7% (20)	5.1% (13)
OCD Severity
CY-BOCS Total Score	22.76 (7.76)	-	-
CY-BOCS Obsessions	10.92 (4.23)	-	-
CY-BOCS Compulsions	11.84 (4.08)	-	-

OCD: Obsessive-compulsive disorder; CC: Clinical controls; NCC: Non-clinical controls; CY-BOCS: Children’s Yale-Brown obsessive-compulsive scale.