Table 2. Sociodemographic and clinical characteristics of the study sample.

Variable	OCD (n = 596)	Controls (n = 599)	P value
Age, years (range)	29.84 ± 10.52 (19–63)	23.44 ± 3.92 (19–48)	<0.001
Male/Female, n	390/206	393/206	0.950
Education, years	13.56 ± 2.38	13.39 ± 1.95	0.169
Onset age of OCD, years	18.48 ± 8.97
Early onset (≤17years), n (%)	328 (55.0)
Late onset (>17years), n (%)	268 (45.0)
Illness duration, years	11.36 ± 8.30
Basal Y-BOCS score
Total	24.92 ± 5.94
Obsessions	12.67 ± 3.03
Compulsions	12.24 ± 3.43
Basal MADRS score	18.59 ± 8.71
Comorbid diagnosis, n (%)
Affective disorders	77 (12.9)
MDD (n = 46)
Depressive disorder, NOS (n = 21)
Bipolar I disorder (n = 5)
Bipolar II disorder (n = 5)
Anxiety disorders	35 (5.9)
Panic disorder (n = 22)
Social phobia (n = 9)
PTSD (n = 3)
GAD (n = 1)
Eating disorders	2 (0.3)
Tic disorder or Tourette’s disorder	24 (4.0)
Others	8 (1.3)
Symptom dimensions, present, n (%)
Symmetry	442 (74.2)
Forbidden thoughts	506 (84.9)
Cleaning	437 (73.3)
Hoarding	201 (33.7)
DS-R score
Core disgust	29.55 ± 8.08	28.58 ± 7.18	0.108
Animal reminder disgust	21.63 ± 6.34	18.11 ± 6.52	<0.001
Contamination-based disgust	9.12 ± 4.03	7.07 ± 3.44	<0.001

OCD, obsessive-compulsive disorder; Y-BOCS, Yale-Brown obsessive-compulsive scale; MADRS, Montgomery-Åsberg depression rating scale; MDD, major depressive disorder; Depressive disorder, NOS, depressive disorder, not otherwise specified; PTSD, posttraumatic stress disorder; GAD, generalized anxiety disorder; DS-R, disgust scale-revised.