Table 1.

Demographics of healthy control (HC) and obsessive-compulsive patient (OCD) samples. Means and standard deviations (in parentheses) are shown. Units: Age [years]; Verbal test score [sum score]; Y-BOCS [sum score]; Performance [% correct]; Reaction time [ms].

Measure	HC (N = 49)	OCD (N = 51)	p =
Age	30.92 (7.31)	33.00 (9.73)	0.231
Sex	20 m/29 f	26 m/25 f	0.324
Verbal test score	32.16 (3.72)	31.20 (4.78)	0.263
Y-BOCS severity scale (sum)a	n. a.	23.25 (5.21)	n. a.
Y-BOCS subdimension taboo	n. a.	3.10 (2.77)	n. a.
Y-BOCS subdimension contamination	n. a.	4.33 (3.37)	n. a.
Y-BOCS subdimension rituals	n. a.	2.41 (2.48)	n. a.
Y-BOCS subdimension hoarding	n. a.	4.47 (2.85)	n. a.
Y-BOCS subdimension doubt	n. a.	4.12 (2.85)	n. a.
Comorbid axis I disorderb	n. a.	43	n. a.
Current medicationc	n. a.	22	n. a.
Performance 0-back	99.62 (1.22)	97.89 (5.07)	0.022
Performance 1-back	96.87 (5.79)	96.62 (5.41)	0.823
Performance 2-back	83.6 (14.58)	81.18 (15.22)	0.426
Performance 3-back	82.44 (18.75)	72.33 (23.82)	0.021
Reaction time 0-back	380 (45)	391 (55)	0.297
Reaction time 1-back	439 (62)	471 (86)	0.033
Reaction time 2-back	545 (85)	582 (93)	0.039
Reaction time 3-back	531 (101)	598 (119)	0.003

Bold p-values indicate significance at p < 0.05.

^aSubdimensions of Y-BOCS according to Katerberg et al. (2010).

^bComorbid mental disorders: 44 mood disorders, 15 anxiety disorders, 3 eating disorders, 2 somatoform disorder, 1 tic disorder, 1 cannabis abuse. 16 OCD patients had more than one comorbid disorder.

^c19 SSRIs, 4 SSNRIs, 5 tricyclic antidepressants, 2 neuroleptics, 1 benzodiazepine.