Table 2. Group comparison on neuropsychological measures.

	OCD M (SD)	Controls M (SD)	OCD N	Controls N	F(df)	Sig	Cohen's d
Processing Speed
Coding scaled score	9.25 (3.75)	11.66 (2.87)	102	161	34.83 (1, 261)	<.00	0.72
Symbol Search scaled score	10.23 (3.40)	11.80 (2.90)	102	66	9.65 (1, 166)	<.01	0.50
Visuospatial abilities
RCFT copy accuracy	61.55 (4.28)	62.52 (7.36)	94	67	1.11 (1, 159)	.29	0.16
Block Design scaled score	10.76 (3.21)	13.70 (3.27)	102	161	50.75 (1, 261)	<.00	0.91
Working Memory
Digit Span scaled score	10.68 (3.03)	10.39 (3.00)	102	161	0.59 (1, 261)	.44	0.10
Arithmetic scaled score	11.15 (3.36)	12.58 (2.83)	102	161	13.90 (1, 261)	<.00	0.46
Non-Verbal Memory
RCFT delay accuracy	43.09 (10.64)	46.94 (12.11)	93	68	4.58 (1, 159)	.03	0.34
Executive Functions
Stroop Word (t score)	46.91 (7.11)	46.98 (7.10)	99	78	.01 (1, 175)	.94	0.01
Stroop Color (t score)	43.70 (8.25)	42.23 (7.62)	99	78	1.47 (1, 175)	.23	0.19
Stroop Color-Word (t score)	45.20 (8.51)	45.87 (9.61)	99	77	.24 (1, 174)	.63	0.07
Stroop Interference (t score)	48.78 (6.36)	50.51 (7.27)	99	77	2.82 (1, 174)	.09	0.25
WCST Categories Completed	4.88 (1.69)	5.00 (1.56)	64	62	.19 (1, 124)	.67	0.07
WCST Percent Perseverative Errors	14.44 (9.75)	14.00 (6.71)	63	62	.09 (1, 123)	.77	0.05
WCST Trials to Complete 1st Category	24.19 (27.48)	18.66 (20.60)	64	62	1.62 (1, 124)	.20	0.23
WCST Failure to maintain set	.98 (1.15)	1.29 (1.27)	64	62	2.01 (1, 124)	.16	0.26
RCFT Copy Organization Score	8.27 (3.47)	8.93 (3.79)	95	68	1.30 (1, 161)	.26	0.18
RCFT Delayed Organization Score	6.57 (3.76)	8.04 (3.92)	94	68	5.81 (1, 160)	.017	0.38

OCD, obsessive-compulsive disorder; RCFT, Rey complex figure test; WCST, Wisconsin Card Sorting Test.