. 2019 Feb 12;49(7):1207–1217. doi: 10.1017/S0033291719000199

Table 1.

Demographic and clinical characteristics and performance data of patients with OCD, unaffected first-degree relatives, and unaffected comparison subjects

	Patients with OCD		Unaffected first-degree relatives of OCD patients		Healthy comparison participants		Statistic	p
	Mean	s.d.	Mean	s.d.	Mean	s.d.	Statistic	p
Demographical data
N	117		50		130
Mean age, years	31.9	9.4	45	14.8	32.1	9.9	F_{(2, 294)} = 30.22	0.00
Gender (% female)	53		64		58		χ²(2) = 1.79	0.41
Verbal IQ	103.2	10	106.5	9.6	104.8	9.4	F_{(2, 294)} = 2.17	0.12
Family history
Depressive disorders n in %	45.3		54		21.5		χ²(2) = 30.44	<0.001
SUD n in %	19.7		14		20.8		χ²(2) = 17.70	<0.001
Anxiety disorders n in %	43.6		42		20.8		χ²(2) = 17.70	<0.001
Clinical data
Obsessive-compulsive inventory-revised	27.32	12.17	5.78	6.12	3.85	3.87	F_(2,294) = 261.82	<0.001
Beck depression inventory-II	18.81	10.70	3.46	4.38	2.53	3.32	F_(2,294) = 169.30	<0.001
State-trait-anxiety-inventory trait^a	53.12	10.34	33.58	7.52	32.19	7.54	F_(2,288) = 191.21	<0.001
Harm avoidant motivation (OC-TCDQ)^a	9.92	3.52	2.82	2.18	2.24	1.89	F_(2,288) = 271.80	<0.001
Sense of incompleteness (OC-TCDQ)^a	15.20	5.40	5.08	3.79	4.39	3.27	F_(2,288) = 211.28	<0.001
Yale-brown obsessive-compulsive scale^b	23.27	9.49
Montgomery-Asberg depression rating scale^b	13.23	9.24
Age of onset^b	23.27	9.49
Performance data^c
Error rate in %	4.41	3.42	3.44	2.97	4.33	3.26	F₍₂₂₈₇₎ = 0.04	0.97
Reaction time for correct trials	436	48	462	54	438	48	F₍₂₂₈₇₎ = 0.18	0.84
Reaction time for errors	371	76	385	66	373	56	F₍₂₂₈₇₎ = 0.18	0.84
Robust post-error slowing	40	45	52	60	39	47	F₍₂₂₈₇₎ = 0.28	0.76

s.d., standard deviation; OCD, obsessive-compulsive disorder; IQ, intelligence quotient; SUD, substance use disorders; OC-TCDQ, Obsessive-Compulsive Trait Core Dimensions Questionnaire.

State-Trait-Anxiety-Inventory and OC-TCDQ scores were missing for six OCD patients.

Yale-Brown Obsessive-Compulsive Scale, Montgomery-Asberg Depression Rating Scale and age of onset were only applicable in patients.

For performance data, age was included as a covariate to account for group differences. Further, performance data of six participants were missing due to technical problems (n = 2 OCD patients, n = 2 relatives, and n = 2 healthy comparison participants).