Up to three primary obsessions and compulsions were listed for each subject through the Yale-Brown Obsessive Compulsive Scale Symptom Checklist. Age at symptom onset was defined as the age when the first obsessive and/or compulsive symptoms were noticed by the patient. Age at disorder onset was dated within 1 month of the first occurrence of obsessive and compulsive symptoms that caused marked distress, were time consuming (more than 1 h a day) or interfered with the patient’s normal daily functioning. Onset was considered abrupt when the symptoms reached a clinically significant intensity within 1 week of onset. All other types of onset were considered insidious. The course of the disorder was considered episodic when at least one circumscribed symptom-free interval (6 months) had occurred; all other types were considered chronic. Duration of untreated illness (DUI) was defined as the interval between onset and the first adequate treatment (appropriate medication at minimally effective dosages for an adequate period of time) according to international guidelines.12 (link)