When administering the Y-BOCS, the interviewer rates the following parameters for both obsessions (items 1 to 5) and compulsions (items 6 to 10); time, interference with function- ing, distress, resistance, and control. Items are rated on a scale ranging from 0 (no symptoms) to 4 (extreme). The total score is the sum ofthe 10 items and therefore ranges from 0 to 40. Y-BOCS scores of 0 to 7 indicate subclinical OCD, 8 to 15 indicate mild symptoms, 16 to 25 indicate moderate symp- toms, 26 to 35 indicate severe symptoms, and 36 to 40 indicate extreme severity.