Alcohol Dependence Scale (ADS)

Abstract

The Alcohol Dependence Scale (ADS), developed by Harvey A. Skinner in 1982, is a widely utilized, 25-item self-report screening instrument designed to measure the severity of alcohol dependence. It assesses both the physical and psychological symptoms associated with problematic alcohol use over the preceding 12 months. The scale provides a quantitative score ranging from 0 to 47, which helps clinicians and researchers determine the level of dependence, ranging from low to severe.

The resulting score is highly indicative of a current diagnosis of alcohol abuse or dependence, particularly aligning with criteria established in the *DSM-III*. The ADS provides an essential tool for guiding appropriate treatment planning and determining the required level of care, often correlated with ASAM Placement Levels.

Keywords

Alcohol Dependence Scale, ADS, Alcohol dependence, Substance abuse, Harvey A. Skinner, Screening tool, Withdrawal symptoms, Delirium tremens, ASAM.

Authors

Harvey A. Skinner, B.A. Allen, J.L. Horn

Purpose

The primary purpose of the Alcohol Dependence Scale (ADS) is to provide a reliable, quantitative measure of the severity of symptoms associated with alcohol dependence. It is intended for use in clinical and research settings to differentiate between levels of problematic drinking, from mild misuse to severe physical dependence requiring intensive intervention.

The scale assists in assessing the validity of self-reports and provides a comprehensive score that correlates with the need for specific intervention strategies, such as those categorized by the ASAM Placement Levels (Levels I through IV), ranging from brief counseling to intensive inpatient care.

Construct

The ADS measures the psychological and physical manifestations of the Alcohol Dependence Syndrome, conceptualizing dependence as a continuum rather than a simple presence or absence of the condition. The 25 items cover various dimensions of dependence, including compulsion to drink, impaired control over consumption, tolerance, and withdrawal symptoms.

Key constructs measured include signs of physical dependence (e.g., tremors, convulsions, delirium tremens, vomiting), loss of control (e.g., inability to stop drinking after one or two drinks), and behavioral/cognitive issues related to preoccupation with alcohol. A score of 9 or more is considered highly indicative of a current clinical diagnosis of alcohol abuse or dependence according to the *DSM-III* criteria.

Validity

The Alcohol Dependence Scale has demonstrated strong construct and criterion validity, as evidenced by its original validation studies published in 1982. The scale was specifically developed to operationalize the Alcohol Dependence Syndrome concept, ensuring that its items accurately reflect the multidimensional nature of dependence.

The validity is further supported by its strong correlation with clinical judgments and established diagnostic criteria. The scale effectively distinguishes between individuals with low, intermediate, substantial, and severe levels of dependence, which is crucial for effective treatment matching.

Reliability

The ADS is recognized for possessing high internal consistency and reliability across diverse clinical populations. Its structure, which utilizes varied response formats (dichotomous, three-choice, and four-choice), ensures comprehensive coverage of symptoms while maintaining measurement stability.

The scale’s widespread adoption in epidemiological surveys, academic research, and clinical practice confirms its stability and consistency in measuring the core symptoms of alcohol dependence over time and across different settings.

Factor Analysis

Factor analytic studies of the ADS generally support a multidimensional structure underlying the 25 items. This structure typically separates the scale into distinct, yet related, subfactors that align with the core components of the dependence syndrome.

These factors often differentiate between symptoms related to physical dependence (e.g., withdrawal symptoms, tolerance, DTs) and those related to behavioral and psychological dependence (e.g., craving, loss of control, preoccupation). This structural clarity enhances the diagnostic utility of the scale by allowing assessors to identify the specific facets of dependence that are most prominent.

Instrument

Test Type: Self-report questionnaire / Screening tool

Format: 25 items utilizing dichotomous, three-choice, and four-choice response options.

Language Available: English (original); widely translated and adapted globally.

Population Group: Individuals suspected of or diagnosed with alcohol use disorders; clinical and non-clinical populations.

Age Group: Adults.

Population Details: Used primarily in addiction treatment centers, psychiatric hospitals, and epidemiological studies to quantify dependence severity.

Test Methodology: Items are scored 0–1 (dichotomous), 0–2 (three-choice), or 0–3 (four-choice), with higher values indicating greater dependence. Total scores range from 0 to 47. Interpretation follows established thresholds: 1-13 (Low), 14-21 (Intermediate), 22-30 (Substantial), and 31-47 (Severe).

Keywords

Alcohol abuse, ASAM Placement Level, Clinical assessment, Addiction Research Foundation, Physical dependence, Screening.

Authors

Author ORCID Identifier: Not specified.

Affiliation Email addresses: Not specified.

Correspondence Address: Harvey A. Skinner, Ph.D., Professor and Chair, Department of Public Health Sciences, Faculty of Medicine, University of Toronto, 12 Queen’s Park Cres. West, Toronto, Ontario, Canada, M5S, 1A8. Phone: (416) 978-8989. Fax: (416) 978-2087.

Permissions & Fee and Test Year

Test Year: 1982 (Original publication).

Permissions/Source: The scale is frequently used in research and clinical settings. Users should consult the Addiction Research Foundation (now part of CAMH) or the primary authors for formal licensing or usage permissions. The instrument was historically available via the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA). The online instrument can be found at: http://www.emcdda.europa.eu/html.cfm/index3583EN.html.

Reference’s

• Skinner HA, Allen BA. Alcohol Dependence Syndrome: Measurement and validation. J. Abnorm. Psychol. 1982;91:199–209. [PubMed]
• Skinner HA, Horn JL. Alcohol Dependence Scale (ADS): User’s Guide. Toronto, Canada: Addiction Research Foundation; 1984.

Items of the Alcohol Dependence Scale (ADS)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way. These questions refer to the past 12 months.

1. How much did you drink the last time you drank?
   • a. Enough to get high or less
   • b. Enough to get drunk
   • c. Enough to pass out
2. Do you often have hangovers on Sunday or Monday mornings?
   • a. No
   • b. Yes
3. Have you had the “shakes” when sobering up (hands tremble, shake inside)?
   • a. No
   • b. Sometimes
   • c. Often
4. Do you get physically sick (e.g., vomit, stomach cramps) as a result of drinking?
   • a. No
   • b. Sometimes
   • c. Almost every time I drink
5. Have you had the “DTs” (delirium tremens) – that is, seen, felt or heard things not really there; felt very anxious, restless, and over excited?
   • a. No
   • b. Sometimes
   • c. Several times
6. When you drink, do you stumble about, stagger, and weave?
   • a. No
   • b. Sometimes
   • c. Often
7. As a result of drinking, have you felt overly hot and sweaty (feverish)
   • a. No
   • b. Once
   • c. Several times
8. As a result of drinking, have you seen things that were not really there?
   • a. No
   • b. Once
   • c. Several times
9. Do you panic because you fear you may not have a drink when you need it?
   • a. No
   • b. Yes
10. Have you had blackouts (“loss of memory” without passing out) as a result of drinking?
    • a. No, never
    • b. Sometimes
    • c. Often
    • d. Almost every time I drink
11. Do you carry a bottle with you or keep one close at hand?
    • a. No
    • b. Some of the time
    • c. Most of the time
12. After a period of abstinence (not drinking), do you end up drinking heavily again?
    • a. No
    • b. Sometimes
    • c. Almost every time I drink
13. In the past 12 months, have you passed out as a result of drinking?
    • a. No
    • b. Once
    • c. More than once
14. Have you had a convulsion (fit) following a period of drinking?
    • a. No
    • b. Yes
    • c. Several times
15. Do you drink throughout the day?
    • a. No
    • b. Yes
16. After drinking heavily, has your thinking been fuzzy or unclear?
    • a. No
    • b. Yes, but only for a few hours
    • c. Yes, for one or two days
    • d. Yes, for many days
17. As a result of drinking, have you felt your heart beating rapidly?
    • a. No
    • b. Yes
    • c. Several times
18. Do you almost constantly think about drinking and alcohol?
    • a. No
    • b. Yes
19. As a result of drinking, have you heard “things” that were not really there?
    • a. No
    • b. Yes
    • c. Several times
20. Have you had weird and frightening sensations when drinking?
    • a. No
    • b. Once or twice
    • c. Often
21. As a result of drinking have you “felt things” crawling on you that were not really there (e.g., bugs, spiders)?
    • a. No
    • b. Yes
    • c. Several times
22. With respect to blackouts (loss of memory):
    • a. Have never had a blackout
    • b. Have had blackouts that last less than an hour
    • c. Have had blackouts that last for several hours
    • d. Have had blackouts that last a day or more
23. Have you tried to cut down on your drinking failed?
    • a. No
    • b. Once
    • c. Several times
24. Do you gulp drinks (drink quickly?)
    • a. No
    • b. Yes
25. After taking one or two drinks, can you usually stop?
    • a. Yes
    • b. No