Hamilton Depression Rating Scale (HDRS-17)

Abstract

The Hamilton Depression Rating Scale (HDRS), particularly the 17-item version (HDRS-17), is a foundational and widely utilized clinician-administered instrument designed to quantify the severity of depression in individuals already diagnosed with a depressive disorder. Developed by Max Hamilton in 1960, this scale has served as the gold standard outcome measure in pharmaceutical and psychological clinical trials for decades. The HDRS-17 assesses key depressive symptoms including mood, sleep disturbance, psychomotor changes, anxiety, and somatic complaints. Scores range from 0 to 52 (depending on the version), with the HDRS-17 scores generally interpreted as 0-6 indicating no depression, 7-17 mild, 18-24 moderate, and scores above 24 indicating severe depression.

Keywords

Hamilton Rating Scale, HDRS-17, Depression severity, Affective disorder, Psychometrics, Clinical assessment, Suicide risk, Insomnia, Psychopharmacology.

Authors

Max Hamilton.

Purpose

The primary purpose of the HDRS-17 is longitudinal assessment—tracking the severity of depressive symptoms over time, particularly in response to treatment. It is highly valued in research for its ability to provide quantifiable data on treatment efficacy in clinical trials involving antidepressants or other therapeutic interventions. Unlike diagnostic tools, the HDRS-17 provides a continuous variable measure of symptom intensity.

The scale relies on a skilled clinician’s interview and observation to score the patient’s condition over the preceding week. The standardized scoring thresholds—0–6 (no depression), 7–17 (mild depression), 18–24 (moderate depression), and scores over 24 (severe depression)—are generally accepted benchmarks used by clinicians to stratify patient severity and monitor response to therapy.

Construct

The HDRS-17 measures the severity of a Major Depressive Episode by assessing a broad range of symptoms that define the disorder. The construct is multi-dimensional, covering core affective symptoms (e.g., sadness, guilt), biological symptoms (e.g., sleep, appetite, energy loss), and cognitive symptoms (e.g., insight, suicidal ideation). This comprehensive approach ensures that the scale captures the heterogeneity inherent in the presentation of depression.

While comprehensive, the scale has been critiqued for its heavy weighting of somatic and sleep-related items. This weighting means that patients exhibiting high levels of physical anxiety or insomnia may receive higher overall scores, potentially overshadowing the severity of core psychological distress or anhedonia. Variations of the scale, such as the 21-item version, include additional factors related to anxiety, depersonalization, and paranoid symptoms to provide a more nuanced picture.

Validity

The HDRS-17 possesses strong face validity, as its items correspond closely to the established diagnostic criteria for depressive disorders. Its criterion validity is supported by its consistent use as the benchmark against which newer depression rating scales are validated. Numerous studies have confirmed its concurrent validity through high correlations with measures like the MADRS and the Beck Depression Inventory (BDI).

However, concerns have been raised regarding its discriminative validity, specifically its ability to differentiate between depressive symptoms and side effects of medication, such as dry mouth or constipation, which are explicitly excluded from Item 11 (Somatic Anxiety). Furthermore, some researchers argue that while it is sensitive to severe depression, its utility in detecting subtle changes in milder depression is less robust (Bagby et al., 2004).

Reliability

Achieving high reliability with the HDRS-17 is highly dependent on the training and expertise of the rater, as it is a subjective, clinician-rated instrument. The need for consistency across raters has led to the development of structured interview guides (such as the SIGH-D) and intensive rater training programs.

Studies focusing on training techniques, including internet-based programs, have shown that standardized training significantly improves inter-rater reliability, ensuring that multiple clinicians scoring the same patient arrive at similar severity ratings (Muller & Dragicevic, 2003; Kobak et al., 2003). The internal consistency (measured by Cronbach’s alpha) of the HDRS-17 is generally acceptable, confirming that the items generally measure the same underlying construct, although variations exist depending on the specific patient group studied.

Factor Analysis

Factor analytical studies of the HDRS-17 typically identify several stable factors rather than a single unifying factor of depression. Common factors consistently extracted include:

• An **Anxiety/Somatic Factor:** Encompassing somatic anxiety, general somatic symptoms, and hypochondriasis.
• A **Core Affective Factor:** Including depressed mood, feelings of guilt, and suicidal ideation.
• A **Retardation Factor:** Covering psychomotor retardation, work and activity impairment, and loss of energy.

The existence of these distinct factors underscores the complexity of depression and allows researchers to examine how specific treatments differentially impact various symptom clusters. For instance, medications may show stronger effects on the somatic factor than on the core affective factor, or vice versa.

Instrument

Test Type: Clinician-rated interview scale.

Format: Semi-structured clinical interview, requiring observation and judgment by a trained mental health professional. Items are scored based on the patient’s condition over the past seven days.

Language Available: Widely translated into numerous languages globally due to its use in international clinical trials.

Population Group: Individuals diagnosed with major depressive disorder or other depressive illnesses.

Age Group: Primarily adults (18+).

Population Details: Used extensively in psychiatric outpatient and inpatient settings, and serves as a primary efficacy measure in research settings for pharmacological and psychotherapeutic interventions.

Test Methodology: The rater scores items on either a 3-point scale (0-2) or a 5-point scale (0-4). The total score is calculated by summing the scores of the 17 core items, yielding a maximum score of 52. Administration time typically ranges from 15 to 30 minutes, depending on the complexity of the patient presentation and the use of a structured guide.

Keywords

Psychomotor retardation, Agitation, Somatic anxiety, Insight, Hypochondriasis, Gold standard, Antidepressant efficacy, Clinical monitoring, Affective symptoms.

Authors

Author ORCID Identifier: Not provided in source.

Affiliation Email addresses: Not provided in source.

Correspondence Address: Not provided in source.

Permissions & Fee and Test Year

The HDRS was first published in 1960. While the core items are generally considered public domain for clinical and academic use, specific structured interview guides (like the SIGH-D) and proprietary rater training materials are often copyrighted and may require licensing fees, particularly for use in large-scale commercial clinical trials. Additional information regarding the scale’s availability can be found here: http://www.springer.com/978-1-58829-966-6.

Reference’s

• Hamilton M: A rating scale for depression. J Neurol Neurosurg Psychiatry 1960;23:56–62.
• Williams JB: A structured interview guide for the Hamilton depression rating scale. Arch Gen Psychiatry 1988; 45:742–7.
• Muller MJ, Dragicevic A: Standardized rater training for the Hamilton Depression Rating Scale (HAMD-17) in psychiatric novices. J Affective Dis 2003; 77:65–9.
• Hamilton M: Hamilton rating scale for Depression (Ham-D), in Handbook of psychiatric measures. Washington DC, APA, 2000, pp 526–8.
• Rush AJ, Trivedi MH, Ibrahim HM, Carmody TJ, Arnow B, Klein DN, Markowitz JC, Ninan PT, Kornstein S, Manber R, Thase ME, Kocsis JH, Keller MB: The 16-Item Quick Inventory of Depressive Symptomatology (QIDS), clinician rating (QIDS-C), and self-report (QIDS-SR): a psychometric evaluation in patients with chronic major depression. Biol Psychiatry, 2003; 54:573–83.
• Kobak KA, Lipsitz JD, Feiger A: Development of a standardized training program for the Hamilton Depression Scale using internet-based technologies: results from a pilot study. J Psychiatric Res 2003; 37:509–15.
• Bagby RM, Ryder AG, Schuller DR, Marshall MB: The Hamilton depression rating scale: has the gold standard become a lead weight? Am J Psychiatry 2004; 161:2163–77.

Items of the Hamilton Depression Rating Scale (HDRS-17)

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

1- Depressed Mood (sadness‚ hopeless‚ helpless‚ worthless)

• 0. Absent
• 1. These feeling states indicated only on questioning
• 2. These feeling states spontaneously reported verbally
• 3. Communicates feeling states non-verbally – i.e.‚ through facial expression‚ posture‚ voice‚ and tendency to weep
• 4. Patient reports VIRTUALLY ONLY these feeling states in his spontaneous verbal and non-verbal communication

2- Feelings of Guilt

• 0. Absent.
• 1. Self reproach‚ feels he has let people down
• 2. Ideas of guilt or rumination over past errors or sinful deeds
• 3. Present illness is a punishment. Delusions of guilt
• 4. Hears accusatory or denunciatory voices and/or experiences threatening visual hallucinations

3- Suicide

• 0. Absent
• 1. Feels life is not worth living
• 2. Wishes he were dead or any thoughts of possible death to self
• 3. Suicidal ideas or gesture
• 4. Attempts at suicide (any serious attempt rates 4)

4- Insomnia Early

• 0. No difficulty falling asleep
• 1. Complains of occasional difficulty falling asleep – i.e.‚ more than 1/2 hour
• 2. Complains of nightly difficulty falling asleep

5- Insomnia Middle

• 0. No difficulty
• 1. Patient complains of being restless and disturbed during the night
• 2. Waking during the night – any getting out of bed rates 2 (except for purposes of voiding)

6- Insomnia Late

• 0. No difficulty
• 1. Waking in early hours of the morning but goes back to sleep
• 2. Unable to fall asleep again if he gets out of bed

7- Work and Activities

• 0. No difficulty
• 1. Thoughts and feelings of incapacity‚ fatigue or weakness related to activities‚ work or hobbies
• 2. Loss of interest in activity‚ hobbies or work – either directly reported by patient‚ or indirect in listlessness‚ indecision and vacillation (feels he has to push self to work or activities)
• 3. Decrease in actual time spent in activities or decrease in productivity
• 4. Stopped working because of present illness

8- Retardation: Psychomotor (slowness of thought and speech; impaired ability to concentrate; decreased motor activity)

• 0. Normal speech and thought
• 1. Slight retardation at interview
• 2. Obvious retardation at interview
• 3. Interview difficult
• 4. Complete stupor

9- Agitation

• 0. None
• 1. Fidgetiness
• 2. Playing with hands‚ hair‚ etc.
• 3. Moving about‚ can’t sit still.
• 4. Hand wringing‚ nail biting‚ hair-pulling‚ biting of lips.

10-Anxiety (psychological)

• 0. No difficulty
• 1. Subjective tension and irritability
• 2. Worrying about minor matters
• 3. Apprehensive attitude apparent in face or speech
• 4. Fears expressed without questioning

11-Anxiety Somatic: Physiological concomitants of anxiety (i.e.‚ effects of autonomic over activity‚“butterflies‚” indigestion‚ stomach cramps‚ belching‚ diarrhea‚ palpitations‚ hyperventilation‚ paresthesia‚ sweating‚ flushing‚ tremor‚ headache‚ urinary frequency). Avoid asking about possible medication side effects (i.e.‚ dry mouth‚ constipation)

• 0. Absent
• 1. Mild
• 2. Moderate
• 3. Severe
• 4. Incapacitating

12-Somatic Symptoms (gastrointestinal)

• 0. None.
• 1. Loss of appetite but eating without encouragement from others. Food intake about normal
• 2. Difficulty eating without urging from others. Marked reduction of appetite and food intake.

13-Somatic Symptoms General

• 0. None
• 1. Heaviness in limbs‚ back or head. Backaches‚ headache or muscle aches. Loss of energy and fatigability.
• 2. Any clear-cut symptom rates “2”

14-Genital Symptoms (symptoms such as loss of libido; impaired sexual performance; menstrual disturbances)

• 0. Absent
• 1. Mild
• 2. Severe

15-Hypochondriasis

• 0. Not present
• 1. Self-absorption (bodily)
• 2. Preoccupation with health
• 3. Frequent complaints‚ requests for help‚ etc.
• 4. Hypochondriacal delusions

16- Loss of Weight

• 0. No weight loss
• 1. Probable weight loss associated with present illness
• 2. Definite (according to patient) weight loss
• 3. Not assessed

17- Insight

• 0. Acknowledges being depressed and ill
• 1. Acknowledges illness but attributes cause to bad food‚ climate‚ overwork‚ virus‚ need for rest‚ etc.
• 2. Denies being ill at all

18- Diurnal variation

• 0. None
• 1. Mild
• 2. Severe

19- Depersonalization and Derealization (such as: feeling of unreality; Nihilistic ideas)

• 0. Absent
• 1. Mild
• 2. Moderate
• 3. Severe
• 4. Incapacitating

20- Paranoid symptoms

• 0. None
• 1. Suspicious
• 2. Ideas of reference
• 3. Delusions of reference

21- Obsessional and Compulsive symptoms

• 0. Absent
• 1. Mild
• 2. Severe

18- Weight Gain

• 0. No weight gain.
• 1. Probable weight gain due to current depression.
• 2. Definite (according to patient) weight gain due to depression.

19- Social Withdrawal

• 0. Interacts with other people as usual.
• 1. Less interested in socializing with others but continues to do so.
• 2. Interacting less with other people in social (optional) situations.
• 3. Interacting less with other people in work or family situations (i.e. where this is necessary).
• 4. Marked withdrawal from others in family or work situations.

20- Appetite Increase

• 0. No increase in appetite.
• 1. Wants to eat a little more than usual.
• 2. Wants to eat somewhat more than normal.
• 3. Wants to eat much more than usual.

21- Increased Eating

• 0. Is not eating more than usual.
• 1. Is eating a little more than usual.
• 2. Is eating somewhat more than usual.
• 3. Is eating much more than normal.

22- Carbohydrate Craving

• 0. No change in food preference or consumption.
• 1. Craving or eating more carbohydrates (starches or sugars) than before.
• 2. Craving or eating much more carbohydrates than before.
• 3. Irresistible craving or eating of sweets or starches.

23- Hypersomnia

• 0. No increase in sleep length.
• 1. At least 1 hour increase in sleep length.
• 2. 2+ hour increase.
• 3. 3+ hour increase.
• 4. 4+ hour increase.

24- Fatigability

• 0. Does not feel more fatigued than usual.
• 1. Feels more fatigued than usual but this has not impaired function significantly; less frequent than in (2).
• 2. More fatigued than usual; at least one hour a day; at least three days a week.
• 3. Fatigued much of the time most days.
• 4. Fatigued almost all the time.