Obsessive-Compulsive Inventory (OCI-R; Foa et al., 2002)
An 18-item questionnaire assessing OCD symptoms, the OCI-R asks
participants to indicate on a 0-4 Likert scale how often they have been
distressed by symptoms such as “I collect things I don’t need”and “I feel I have to repeat certain numbers”. S cores of 0
represent answers of “not at all”, through to 4
“extremely”. Based on the original paper, the mean score for
persons with OCD is 28 with a range of 0-72, with a score of 21
indicating the likely presence of OCD.