Purpose of the Scale

The purpose of this Scale is to detect symptoms of obsessive-compulsive disorder (OCD) in children and adolescents. The Leyton Obsessional Inventory – Child Version (LOI-CV) is one of the most well-known scales for measuring and evaluating obsessive-compulsive symptoms in young people.

Scale Description

The Scale was developed by Flament in 1988, consists of 20 items, and includes two subscales.

Scale Scoring

Each of the 20 questions includes two responses: the presence or absence of the symptom described in the item (yes/no), and the level of interference caused by the symptom if present, ranging from 0 (no interference) to 3 (high interference). If the respondent selects “yes,” they are then asked to rate the interference of the item on a 4-point Likert scale.

Statistical Analysis of the Scale

Invariance analyses across unconstrained models, factor loading constraints, and error variance constraints showed that the Leyton scale is invariant with respect to the presence or absence of OCD, age, and gender. The cutoff scores for evaluating the LOI-CV are 15 for the “yes” score, 25 for the interference score, and 35 for the total score. Higher scores indicate a greater level of interference, while lower scores indicate a lesser level of interference.

Validity and Reliability of the Scale

The Spanish version of the LOI-CV was developed using the back-translation method described by Hambleton (2005). Cronbach’s alpha was acceptable for the LOI-CV Survey Form (α = 0.79).

References

Akinci, E., & Sevi, O. M. (2020). The effect of psycho-education about maternal attitudes on childhood obsessive-compulsive disorder symptoms. Klinik Psikiyatri Dergisi, 23(1), 7-22.

Flament, M. F., Whitaker, A., Rapoport, J. L., Davies, M., Berg, C. Z., Kalikow, K., … & Shaffer, D. (1988). Obsessive compulsive disorder in adolescence: an epidemiological study. Journal of the American Academy of Child & Adolescent Psychiatry, 27(6), 764-771.

Lambe, L. J., Burton, C. L., Anagnostou, E., Kelley, E., Nicolson, R., Georgiades, S., … & Crosbie, J. (2021). Clinical validation of the parent-report Toronto Obsessive–Compulsive Scale (TOCS): A pediatric open-source rating scale. JCPP Advances, 1(4), e12056.

Stein, D., Meged, S., Bar-Hanin, T., Blank, S., Elizur, A., & Weizman, A. (1997). Partial eating disorders in a community sample of female adolescents. Journal of the American Academy of Child & Adolescent Psychiatry, 36(8), 1116-1123.

Storch, E. A., Park, J. M., Lewin, A. B., Morgan, J. R., Jones, A. M., & Murphy, T. K. (2011). The Leyton Obsessional Inventory-Child Version Survey Form does not demonstrate adequate psychometric properties in American youth with pediatric obsessive-compulsive disorder. Journal of Anxiety Disorders, 25(4), 574-578.

For the development and analysis of research data based on the above scale, as well as for further information, contact the DatAnalysis team!