It is a scale developed to assess the severity of OCD symptoms and scored by an expert evaluator. In this scale consisting of a total of 19 items, the scores of the first 10 items are evaluated; the sum of items 1-5 gives obsession scores, the sum of items 6-10 gives compulsion scores, and the sum of items 1-10 gives obsession-compulsion scores.
Yale Brown Obsessive Compulsive Disorder Scale (Y-BOCS) was developed by Goodman et al. (1989). This scale, which has been used in many studies since 1989, has also been used in DSM-IV field studies. Y-BOCS is superior to other scales with its sensitivity in measuring the severity of obsessive-compulsive symptoms, assessing the clinical course and the results of treatment. The Y-BOCS includes a symptom checklist with a total of 74 questions, each with a varying number of questions under the headings of classification for obsessions and compulsions. This symptom checklist provides detailed symptom screening and assessment of their severity. The evaluation of the scale is done by the clinician. The type, number or content of symptoms is not taken into account when assessing symptom severity. Each symptom receives a score ranging from 0-4 according to the extent to which it takes up the patient's time, affects normal life, causes subjective discomfort, and to what extent the patient actively resists and controls it. The clinician then calculates the general obsession score (GOP), general compulsion score (GCS) and total score (GTOP). According to the Y-BOCS scale, the highest score that patients can get for GOP and GKP is 20. GTOP is the sum of GOP and GKP and the highest score that patients can get is 40. Turkish validity and reliability study was conducted by Karamustafalıoğlu O. et al.