Yale-Brown Obsessive Compulsive Scale (Y-BOCS): 10-Item Scoring, Y-BOCS-II, CY-BOCS, and Remission

The Yale-Brown Obsessive Compulsive Scale (Y-BOCS)—developed by Wayne K. Goodman, Lawrence H. Price, Steven A. Rasmussen, and colleagues at Yale University and Brown University in 1989 (Archives of General Psychiatry, 46[11]:1006–1016)—is the gold-standard clinician-administered rating instrument (ClinRO) for quantifying the severity of Obsessive-Compulsive Disorder (OCD) and evaluating treatment efficacy in psychiatry clinical trials. Crucially, the Y-BOCS was designed to measure symptom severity independently of the specific content or number of obsessions and compulsions, ensuring that a patient with a single incapacitating contamination ritual is scored on the same metric as a patient with multiple checking and symmetry rituals.

Two-Stage Administration: The Y-BOCS Symptom Checklist and Target Symptom List

Before scoring the 10 severity items, the clinician administers the Y-BOCS Symptom Checklist (Y-BOCS-SC), a comprehensive semi-structured inventory of more than 60 specific obsessions (aggressive, contamination, sexual, hoarding/saving, religious/scrupulosity, symmetry/exactness, and somatic/superstitious categories) and compulsions (cleaning/washing, checking, repeating, counting, ordering/arranging, hoarding, and miscellaneous mental rituals), marked as current (past week/month) or past.

From the endorsed current symptoms, the clinician and patient collaboratively identify the 3 most distressing/impairing obsessions and 3 most distressing/impairing compulsions on a Target Symptom List. The subsequent 10 severity items rate the combined impact of all current obsessions and compulsions—anchored by those target symptoms—over the past 7 days.

How Are the 10 Core Severity Items of the Goodman Yale-Brown Obsessive Compulsive Scale (Y-BOCS, 0–40) Scored?

Although the full Y-BOCS interview form contains 19 items (Items 11–19 assess insight, avoidance, indecisiveness, pathological responsibility, pervasive slowness, pathological doubting, global severity, global improvement, and reliability), only Items 1 through 10 are summed to produce the Total Y-BOCS Severity Score (range 0–40).

The 10 core items are divided symmetrically into two 5-item subscales, with every item rated by the clinician on a 5-point ordinal scale from 0 (none) to 4 (extreme):

Dimension Assessed	Obsession Subscale (Items 1–5, Range 0–20)	Compulsion Subscale (Items 6–10, Range 0–20)	Anchor Examples (0 to 4 Scale)
1. Time Occupied / Spent	Item 1: Time occupied by obsessive thoughts (0–4)	Item 6: Time spent performing compulsive behaviors (0–4)	0 = None; 1 = Mild (<1 hr/day); 2 = Moderate (1–3 hrs/day); 3 = Severe (>3 to 8 hrs/day); 4 = Extreme (>8 hrs/day)
2. Functional Interference	Item 2: Interference due to obsessive thoughts (0–4)	Item 7: Interference due to compulsive behaviors (0–4)	0 = None; 1 = Mild (slight social/work interference); 2 = Moderate (definite interference, manageable); 3 = Severe (substantial impairment); 4 = Extreme (incapacitating)
3. Subjective Distress / Anxiety	Item 3: Distress associated with obsessive thoughts (0–4)	Item 8: Distress if prevented from performing compulsions (0–4)	0 = None; 1 = Mild; 2 = Moderate (disturbing/manageable); 3 = Severe (marked anxiety); 4 = Extreme (near-constant disabling distress)
4. Resistance Effort	Item 4: Resistance against obsessions (0–4)	Item 9: Resistance against compulsions (0–4)	0 = Always resists (or symptoms so minimal no resistance needed); 1 = Tries to resist most of the time; 2 = Makes some effort; 3 = Yields to all with reluctance; 4 = Completely and willingly yields
5. Degree of Control	Item 5: Degree of control over obsessive thoughts (0–4)	Item 10: Degree of control over compulsive behavior (0–4)	0 = Complete control; 1 = Much control; 2 = Moderate control; 3 = Little control; 4 = No control (experienced as completely involuntary)

What Are the Y-BOCS Severity Bands and Consensus Treatment Response (≥35% Reduction) and Remission (≤12) Criteria?

In clinical practice, mental health intake forms, and FDA/EMA registration trials (typically captured via electronic clinical outcome assessment [eCOA] platforms), Y-BOCS total scores (0–40) are stratified into five standard severity bands:

• 0–7: Subclinical / Non-clinical range
• 8–15: Mild OCD (most randomized controlled trials require a baseline Y-BOCS ≥ 16 for trial entry)
• 16–23: Moderate OCD
• 24–31: Severe OCD
• 32–40: Extreme OCD

To harmonize variable responder definitions across pharmacotherapy (SSRIs, clomipramine) and Exposure and Response Prevention (ERP) cognitive-behavioral therapy trials, David Mataix-Cols, Helen Blair Simpson, and an international Delphi panel of OCD investigators published the International Expert Consensus Criteria in World Psychiatry (2016):

• Treatment Response: A ≥35% reduction in total Y-BOCS score from baseline to endpoint PLUS a Clinical Global Impressions–Improvement (CGI-I) rating of 1 (“very much improved”) or 2 (“much improved”), lasting for at least 1 week.
• Partial Response: A ≥25% to <35% reduction in total Y-BOCS score plus a CGI-I rating of at least 3 (“minimally improved”).
• Clinical Remission: A total score of Y-BOCS ≤ 12 (if clinical interview data are unavailable, or accompanied by CGI-Severity of 1 [normal] or 2 [borderline mentally ill]), sustained for at least 1 week.

How Do the Y-BOCS-II (0–50 Scale Eliminating Resistance Item) and Children’s CY-BOCS Adapt the Instrument?

Over two decades of clinical trial use revealed two psychometric limitations in the original 1989 Y-BOCS that led Eric A. Storch, Wayne K. Goodman, and colleagues to publish the Yale-Brown Obsessive-Compulsive Scale—Second Edition (Y-BOCS-II) in 2010 (Psychological Assessment, 22[2]:223–232), alongside the pediatric Children’s Yale-Brown Obsessive Compulsive Scale (CY-BOCS) (Scahill et al., 1997):

1. Eliminating the “Resistance to Obsessions” Item (Item 4) in Y-BOCS-II: On the original Y-BOCS, Item 4 rewards patients with a lower (better) score when they actively fight or try to suppress intrusive thoughts (“Always resists” = 0). However, modern Exposure and Response Prevention (ERP) and Acceptance and Commitment Therapy (ACT) explicitly teach patients not to fight or neutralize intrusive thoughts—because active thought suppression paradoxically rebounds obsession frequency. Consequently, Item 4 showed poor item-total correlation and penalized successful ERP patients. The Y-BOCS-II replaces Item 4 (“Resistance against obsessions”) with “Obsession-Free Interval” (measuring the longest continuous daily period free of intrusive thoughts).
2. Expanding Item Scaling from 0–4 to 0–5 (Total Range 0–50) and Integrating Avoidance in Y-BOCS-II: In patients with extreme OCD (Y-BOCS > 32), the original 0–4 scale suffered from a ceiling effect, and ritual time was artificially low in patients who used massive behavioral avoidance to prevent triggers. The Y-BOCS-II expands each of the 10 items to a 6-point scale (0–5), yielding a total score range of 0–50 (Obsessions 0–25, Compulsions 0–25), and embeds behavioral avoidance directly into the interference and compulsions scoring anchors.
3. Children’s Yale-Brown Obsessive Compulsive Scale (CY-BOCS; Scahill et al., 1997): Validated for youth aged 6 to 17 years (complementing broader pediatric anxiety/depression screens such as the RCADS and adult anxiety tools like the GAD-7). The CY-BOCS retains the 10-item 0–4 structure (0–40 total range: 0–20 Obsessions, 0–20 Compulsions) with developmentally adapted language and conducts joint or consecutive interviews with both the child/adolescent and a parent/caregiver so family accommodation of rituals is accurately captured.

Frequently Asked Questions

How are the 10 core severity items (5 Obsession items and 5 Compulsion items, rated 0–4) of the Goodman Yale-Brown Obsessive Compulsive Scale (Y-BOCS, 0–40) scored?

The clinician rates 5 Obsession items (Items 1–5, subtotal 0–20) and 5 Compulsion items (Items 6–10, subtotal 0–20) across five identical domains—time occupied, functional interference, subjective distress, resistance effort, and degree of control—on a 0 (none) to 4 (extreme) ordinal scale, summing all 10 items to a 0–40 total severity score.

What are the Y-BOCS severity bands (8–15 mild, 16–23 moderate, 24–31 severe, 32–40 extreme) and consensus treatment response (≥35% reduction) and remission (≤12) criteria?

Total Y-BOCS scores of 0–7 are subclinical, 8–15 mild, 16–23 moderate, 24–31 severe, and 32–40 extreme. Under the Mataix-Cols et al. (2016) international expert consensus, treatment response requires a ≥35% reduction in baseline Y-BOCS score (plus CGI-I of 1 or 2), and clinical remission requires an endpoint score of Y-BOCS ≤ 12 sustained for at least 1 week.

How do the Y-BOCS-II (0–50 scale eliminating resistance item) and Children’s CY-BOCS adapt the instrument?

The Y-BOCS-II (Storch et al., 2010) expands item ratings to 0–5 (0–50 total score), integrates behavioral avoidance into core severity items, and replaces Item 4 (“Resistance against obsessions”) with “Obsession-free interval” so patients practicing ERP therapy are not penalized for accepting rather than suppressing intrusive thoughts. The CY-BOCS (Scahill et al., 1997) adapts the 0–40 scale for ages 6–17 by synthesizing child and parent informant interviews.