Young Mania Rating Scale (YMRS): Scoring and Cutoffs

The YMRS is the criterion-standard 11-item clinician-administered scale for measuring manic symptom severity in bipolar disorder. Validated in 100+ clinical trials and translated into 40+ languages.

What the YMRS measures

The YMRS (Young Mania Rating Scale) is an 11-item clinician-administered rating scale for manic symptom severity developed by Young, Biggs, Ziegler, and Meyer (1978) at the Medical College of Virginia. It is the most widely used mania outcome measure in clinical trials and psychiatric practice worldwide, endorsed by major guidelines for assessing and tracking bipolar I mania.

Items cover the core domains of a manic episode: elevated mood, increased motor activity, sexual interest, reduced sleep, irritability, pressured speech, thought disorder, grandiose content, disruptive behaviour, appearance changes, and impaired insight. Seven items are scored 0–4; four items (irritability, speech, content, and disruptive-aggressive behaviour) are weighted and scored 0–8 due to their greater clinical significance. Total scores range from 0 to 60.

Although originally designed for clinician administration, the YMRS is increasingly used as a self-report (patient-rated) measure in clinical research settings. Patient-rated versions show acceptable convergent validity with clinician-rated scores, particularly for mild-to-moderate mania.

How to administer the YMRS

The YMRS is designed for clinician administration and requires clinical judgment for accurate scoring - particularly for items like thought disorder, content (delusions/hallucinations), and disruptive-aggressive behaviour. Each item is rated over the past 48 hours (or since last assessment). Items 5, 6, 8, and 9 are weighted double (scored 0-8; remaining items 0-4). Score range: 0-60.

Educational and training purposes only. Not a substitute for trained clinician assessment.

YMRS scoring and interpretation

Total score = sum of all 11 items (items 5, 6, 8, 9 scored 0-8; remaining items 0-4). Score range: 0-60. Use the score interpreter above to look up the severity band; the band anchors come from an equipercentile linkage of YMRS scores to CGI-S ratings in 2,988 trial participants (Samara et al., 2023).

Minimum Clinically Important Difference (MCID)

A change of ≥5–6 points on the YMRS is generally considered clinically meaningful in treatment trials. Response is often defined as ≥50% reduction from baseline; remission as a score ≤12. These thresholds vary by study protocol and clinical context.

Psychometric properties

• Original study (Young et al., 1978): Interrater correlation was 0.93 for the total score and 0.66 to 0.92 for individual items. Scores correlated highly with an independent global rating and with two other mania scales, correlated with subsequent length of hospital stay, and distinguished patients before and after two weeks of treatment.
• Severity threshold and MCSD (Lukasiewicz et al., 2013): In 3,459 patients with acute manic or mixed states, the optimal threshold for marked severity was 25, and the minimal clinically significant difference was 6.6 points.
• CGI-S linkage (Samara et al., 2023): In 2,988 participants from eight randomized trials, YMRS scores of about 6, 12, 20, 30, 40 and 52 corresponded to borderline, mildly, moderately, markedly, severely and among the most extremely ill on the CGI-S.
• Adolescents (Patel et al., 2007): In 99 adolescents with acute mania, a reduction of 55% or more was the optimal response cutoff and an endpoint score of 12 or less the optimal remission cutoff.

Limitations

• Not a diagnosis. The YMRS measures current manic symptom severity; it does not diagnose bipolar disorder.
• Requires clinical judgement. Items such as thought disorder, content and disruptive-aggressive behaviour need a trained rater.
• Thresholds vary. Remission (≤12, sometimes ≤8), response (≥50% or ≥55% reduction) and severity thresholds differ between studies and populations.
• Short window. Ratings cover the preceding 48 hours, so a single score reflects current state only.
• Mania only. It does not assess depressive symptoms; pair it with a depression measure in bipolar disorder.

YMRS Item Structure

The YMRS covers 11 symptom domains. Four items are weighted double (scored 0–8) to reflect their clinical importance in distinguishing mania severity.

YMRS vs MDQ for Bipolar Assessment

The YMRS and MDQ serve different purposes in bipolar disorder assessment, one measures current mania severity, the other screens for lifetime bipolar disorder history.

Measuring mania in HiBoop

HiBoop does not offer the YMRS; this page is reference material. For bipolar screening, HiBoop offers the MDQ and HCL-33, with automated scoring and tracking over time.