Table 1.

Overview of all inclusion and exclusion criteria for patients and healthy controls.

OCD Patients		Healthy controls
Inclusion criteria	Exclusion criteria	Inclusion criteria	Exclusion criteria
OCD as primary diagnosis	Any ICD-10 F0, F1 or F2 diagnosis	Inclusion criteria for the control group were defined as fitting to the respective matching partner by the following criteria: Sex Age (±1 year) Handedness Highest level of education (as far as possible)	The same exclusion criteria as for the patient group
Cutoff for washing subtype in OCI-R reached.	Current psychotherapy		Plus
Y-BOCS ≥ 16	Current or prior (1 month) medication with antipsychotics or benzodiazepines
Illness duration of at least 4 months	Other but unstable (1 month) medication (e.g., with SSRIs)		Any current or past (adulthood) psychological disorder
	Severe depression or suicidal tendencies		Reaching any OCI-R or BDI-II cutoff
	Manic symptoms		Any psychotropic treatment in the past
	PTSD		Any substance abuse in the last 6 months (SCID-I)
	Borderline, antisocial, paranoid, schizoid personality disorder		Job with “ritualized hand washing” (e.g., physician, nurse)
	Neurological illness
	MRI exclusion criteria