Children’s Yale-Brown Obsessive Compulsive Scale (CYBOCS-2)

Abstract

The Children’s Yale-Brown Obsessive Compulsive Scale, Second Edition (CYBOCS-2), is a specialized, clinician-rated instrument designed to quantify the severity and phenomenology of Obsessive-Compulsive Disorder (OCD) in children and adolescents. Originally developed from the adult Yale-Brown Obsessive Compulsive Scale (Y-BOCS), the CYBOCS was first introduced in 1997 and subsequently revised in 2010 to produce the current second edition. The scale utilizes a semi-structured interview format, which includes a comprehensive symptom checklist used as a diagnostic aid, followed by a 10-item severity rating scale. The CYBOCS-2 is widely employed in both clinical practice to monitor patient progress and as a primary outcome measure in clinical trials assessing the efficacy of pharmacological and behavioral treatments.

Keywords

OCD, CYBOCS-2, Obsessions, Compulsions, Pediatric Assessment, Clinical Rating Scale, Severity Measurement, Semi-structured interview, Treatment Outcome.

Authors

Wayne K. Goodman (Original Y-BOCS Developer), Lawrence Scahill, Michael Riddle, Maureen Mcswiggin-Hardin, Stuart Ort, Eric A. Storch (CYBOCS-2 Revision Lead).

Purpose

The primary purpose of the Children’s Yale-Brown Obsessive Compulsive Scale (CYBOCS-2) is to provide a standardized, reliable method for assessing the severity of obsessive-compulsive symptoms in pediatric populations. It is specifically designed to measure symptom intensity over the preceding 30 days, offering a detailed snapshot of the child’s current clinical status.

While the scale was not originally intended as a standalone diagnostic tool, its initial symptom checklist is frequently used by clinicians to aid in the identification and classification of prominent obsessions and compulsions. Crucially, the final severity score serves as an essential metric for tracking therapeutic progress, making it an indispensable instrument for evaluating treatment response in both clinical settings and controlled clinical trials.

Construct

The CYBOCS-2 measures the core psychopathology associated with Obsessive-Compulsive Disorder (OCD). The construct is operationalized across two distinct yet interconnected dimensions: Obsessions and Compulsions. The severity section of the scale assesses five key facets of the patient’s experience for each dimension:

• Time spent on symptoms (Frequency/Duration).
• Interference caused by symptoms (Impairment).
• Distress associated with symptoms (Emotional impact).
• Resistance or attempts to neutralize symptoms (Control).
• Degree of control over symptoms (Ability to stop or delay).

By independently rating these 10 items (five for obsessions and five for compulsions), the scale provides a nuanced total score reflecting the overall functional impairment and distress caused by the disorder.

Validity

The validity of the CYBOCS is well-established through extensive clinical use and research since its initial validation study (Scahill et al., 1997). The scale demonstrates strong construct validity, as evidenced by its high correlation with other measures of OCD severity and its ability to differentiate between children with OCD and those with other anxiety disorders. Furthermore, its established role as a primary outcome measure in randomized controlled trials confirms its criterion validity, demonstrating its sensitivity to change following effective treatment interventions.

Reliability

The CYBOCS-2 possesses excellent psychometric properties, ensuring consistent and stable measurement of OCD severity. The scale exhibits high internal consistency across its subscales, indicating that its items measure the same underlying construct reliably. Specifically, the reported alpha coefficients are highly robust:

• Internal Consistency (Severity Scale): Alpha (α) = 0.89.
• Internal Consistency (Obsession Scale): Alpha (α) = 0.86.

These values demonstrate that the scale is highly reliable for use in clinical diagnostics and longitudinal tracking of symptom reduction.

Factor Analysis

While the original source does not detail complex statistical factor analysis results, the CYBOCS-2 is fundamentally structured around a two-factor model mirroring the core components of OCD: Obsessions and Compulsions. The 10 severity items are evenly divided, contributing five items to the Obsession Severity score and five items to the Compulsion Severity score. This clear factorial structure supports the clinical utility of the scale by allowing clinicians to track changes in obsessions and compulsions independently, though an overall severity score is typically used for primary outcome assessment.

Instrument

Test Type: Clinician-rated severity scale and semi-structured interview.

Format: Semi-structured interview with a preceding symptom checklist (used as a diagnostic aid). The 10 severity items are rated on a 6-point scale (0 to 5).

Language Available: English (Original; translations are widely available for research purposes).

Population Group: Pediatric and Adolescent patients.

Age Group: 8 to 17 years of age.

Population Details: Individuals presenting with symptoms consistent with Obsessive-Compulsive Disorder (OCD) or related anxiety disorders.

Test Methodology: The clinician conducts a semi-structured interview with the child, often with a parent present depending on the child’s age or anxiety level. They first identify prominent symptoms occurring in the last 30 days using the symptom checklist. Then, the clinician rates the child’s answers on the 10 severity items, resulting in a total score ranging from 0 to 40, where higher scores indicate greater severity.

Keywords

Pediatric OCD, Clinical Assessment, Treatment Outcome Measure, Severity Index, Yale-Brown Scale, Child Psychiatry, Psychometric properties, Internal consistency.

Authors

Author ORCID Identifier: Not provided in source material.

Affiliation Email addresses: Not provided in source material.

Correspondence Address: Not provided in source material.

Permissions & Fee and Test Year

The Children’s Yale-Brown Obsessive Compulsive Scale, Second Edition (CYBOCS-2), is generally considered freely available for clinical use and can often be located through general online search engines. However, investigators planning to use the instrument for formal research purposes or large-scale studies are typically required to contact the corresponding authors (e.g., Dr. Wayne Goodman or Dr. Eric Storch) to ensure proper attribution and compliance with research usage guidelines. The original CYBOCS was validated in 1997, and the CYBOCS-2 revision was published in 2010.

Reference’s

• Goodman, W. K., Price, L. H., Rasmussen, S. A., Mazure, C., Fleischmann, R. L., Hill, C. L., … Charney, D. S. (1989). The Yale-Brown Obsessive Compulsive Scale: I. Development, Use, and Reliability. Archives of General Psychiatry, 46(11), 1006–1011. https://doi.org/10.1001/archpsyc.1989.01810110048007
• Scahill, L., Riddle, M., Mcswiggin-Hardin, M., & Ort, S. (1997). Children’s Yale-Brown obsessive compulsive scale: Reliability and validity. Journal of the American Academy of Child and Adolescent Psychiatry, 36(6), 844–852.
• Storch, E. A., Rasmussen, S. A., Price, L. H., Larson, M. J., Murphy, T. K., & Goodman, W. K. (2010). Development and Psychometric Evaluation of the Yale-Brown Obsessive-Compulsive Scale-Second Edition. Psychological Assessment, 22(2), 223–232. https://doi.org/00012030-201006000-00003

Items of the Children’s Yale-Brown Obsessive Compulsive Scale (CYBOCS-2)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The CYBOCS-2 utilizes a 10-item severity rating structure, scored on a 6-point scale (0 to 5). These items are rated by the clinician based on the preceding semi-structured interview covering the last 30 days of symptoms. An overall score (0–40) is produced by summing the scores of the 10 items.

The 10 severity items are divided equally into two domains:

Obsession Severity Items (Items 1-5)

1. Time Spent on Obsessions (Frequency/Duration).
2. Interference Caused by Obsessions (Impairment).
3. Distress Associated with Obsessions (Emotional impact).
4. Resistance Against Obsessions (Efforts to neutralize).
5. Degree of Control Over Obsessions (Ability to stop/delay).

Compulsion Severity Items (Items 6-10)

1. Time Spent on Compulsions (Frequency/Duration).
2. Interference Caused by Compulsions (Impairment).
3. Distress Associated with Compulsions (Emotional impact).
4. Resistance Against Compulsions (Efforts to stop).
5. Degree of Control Over Compulsions (Ability to stop/delay).