LOI
Leyton Obsessional Inventory (LOI)
The Leyton Obsessional Inventory is a self-report questionnaire designed to identify and quantify obsessive and compulsive symptoms and their impact. Historically widely used in clinical psychology and psychiatry, it explores the presence of intrusive thoughts, doubts, checking, rituals, orderliness, cleanliness, and other manifestations of the obsessive spectrum. It provides an overall estimate of the symptoms and the associated distress, but its interpretation must remain clinical and be supplemented by an interview.
- Number of questions
- 69 questions
- Estimated duration
- 15 minutes
- Language
- English
- Original name
- Leyton Obsessional Inventory
- Target audience
- Adults
- Authors
- John Cooper (1970)
- Category
- OCD
Scoring & interpretation
Items are usually scored as a dichotomous yes/no response to identify the symptoms present. Positive responses are added up to obtain a symptom score, then the endorsed symptoms can be weighted by ratings of resistance and of distress or interference. A higher score indicates more marked and more pervasive obsessive-compulsive symptoms. Interpretation relies mainly on the overall clinical profile, with no single universal cutoff to be used in isolation.
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