The 10-item Y-BOCS scale, which evaluates the severity of obsessions and compulsions separately, is the standard scale used in treatment outcome studies of ► obsessive compulsive disorder (OCD) (Goodman et al. 1989a, b). The rater measures obsessions and compulsions in terms of the time occupied, how much they interfere with functioning, the patient's degree of distress, and his or her attempts to resist symptoms and the ability to control them successfully. To assess the patient's symptoms, the clinician may wish to use the Y-BOCS symptom checklist, which lists 40 obsessions and 29 compulsions. The 18-item Obsessive-Compulsive Inventory is a shorter alternative. The Y-BOCS scale and checklist along with instructions for their use are available at http://apple.cmu.edu.tw/_ u901039/Rating-Scale-YBOCS.pdf. In clinical practice, some clinicians measure symptom change by simply asking the patient to estimate the amount of time taken by symptoms in an average day in the past week.
Goodman WK, Price LH, Rasmussen SA, Mazure C, Fleischmann, RL Hill CL, Henninger GR, Charney DS (1989a) The Yale-Brown Obsessive Compulsive Scale: part I. Development, use, and reliability. Arch Gen Psychiatry 46:1006-1012 Goodman WK, Price LH, Rasmussen SA, Mazure C, Delgado P, Heninger GR, Charney DS (1989b) The Yale-Brown Obsessive Compulsive Scale: part II. Validity. Arch Gen Psychiatry 46:1012-1016
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