Drug Use Disorders Identification Test – DUDIT

Abstract

The Drug Use Disorders Identification Test (DUDIT) is a validated, 11-item self-report screening instrument designed to identify individuals experiencing problematic drug use, including those who may meet criteria for Substance Use Disorder (SUD). Developed by Anne H. Berman and her team, based on the structure of the Alcohol Use Disorders Identification Test (AUDIT), the DUDIT assesses patterns of use, symptoms of dependence, and negative consequences related to drug consumption over the past 12 months. It is utilized across various clinical, forensic, and general population settings to facilitate early intervention and referral to treatment.

Keywords

Drug Use Disorders Identification Test, DUDIT, Substance Use Disorder, drug screening, addiction, psychometrics, dependence, substance abuse.

Authors

Anne H. Berman, H. Bergman, T. Palmstierna, F. Schlyter.

Purpose

The primary purpose of the DUDIT is to serve as a brief, efficient, and reliable method for identifying hazardous, harmful, and dependent patterns of drug use. It is intended to be easily self-administered in settings where time constraints prevent the use of more extensive clinical interviews, such as primary care facilities, emergency rooms, and correctional environments.

The instrument provides clinicians and researchers with a quantifiable score that reflects the severity of an individual’s drug involvement. The cut-off scores established through validation studies help differentiate between low-risk users, hazardous users who require brief intervention, and individuals with probable dependence who require specialized treatment for Substance Use Disorder.

Construct

The DUDIT measures the core construct of problematic drug use, encompassing the behavioral and physiological symptoms associated with drug abuse and dependence. The 11 items are structured to capture key dimensions of drug use pathology, which align closely with established diagnostic criteria for substance disorders. These dimensions include frequency and intensity of use, symptoms of impaired control (craving and inability to stop), and social and physical consequences resulting from drug use.

The scale’s comprehensive nature allows it to serve as a strong indicator of the need for further evaluation, thereby bridging the gap between general population screening and formal psychiatric diagnosis.

Validity

The validity of the DUDIT has been extensively supported across multiple studies, demonstrating strong performance in diverse populations. It exhibits excellent criterion validity, showing high sensitivity and specificity when compared against gold-standard diagnostic interviews for drug dependence and abuse. For instance, validation studies have confirmed its utility in accurately classifying individuals in high-prevalence settings, such as detoxification and criminal justice systems.

Construct validity is confirmed by the scale’s high correlation with measures of substance use severity and related psychological distress. The DUDIT’s structure, which mirrors the successful AUDIT, ensures that it captures both frequency of use and the negative consequences associated with substance misuse, reinforcing its utility as a comprehensive screening instrument.

Reliability

The DUDIT demonstrates high levels of internal consistency, which is crucial for a brief psychometrics instrument. Internal consistency, typically measured by Cronbach’s alpha, consistently exceeds 0.90 in research samples, indicating that the 11 items are highly homogenous and measure a single, reliable underlying dimension of problematic drug use. Additionally, test-retest reliability studies have shown stable scores over short intervals, confirming the consistency of the measure over time when administered to stable populations.

Factor Analysis

Factor analysis of the DUDIT typically supports a robust, underlying single-factor model, reflecting the severity of drug use problems. This unidimensional structure justifies its use as a single summated score for screening purposes. However, some advanced analyses suggest a potential two-factor solution, often separating the items related to Hazardous Use (frequency and quantity) from those related to Dependence and Consequences (loss of control, neglect, harm). Despite this potential two-factor distinction, the strong overall general factor confirms the DUDIT’s suitability as a brief measure of global drug use pathology.

Instrument

Test Type: Self-report questionnaire, screening instrument.

Format: 11 items. Items are scored on either a 5-point Likert scale (0–4) or a 3-point scale (weighted 0, 2, or 4), resulting in a total score ranging from 0 to 44.

Language Available: Swedish (Original), English, and various other translations.

Population Group: General adult population, clinical patients, and forensic populations.

Age Group: Primarily 18 years and older.

Population Details: Validation studies have focused on high-risk groups, including individuals in detoxification and criminal justice settings, alongside general population samples, ensuring its applicability across diverse demographic and clinical contexts.

Test Methodology: Brief, self-administered inventory requiring approximately 2–5 minutes. Scoring is straightforward summation, with established cutoffs (e.g., 6+ for men and 2+ for women) used to identify hazardous use requiring intervention.

Keywords

Drug abuse, dependence criteria, psychometric scale, clinical assessment, addiction severity, self-report, harm reduction, screening methodology.

Authors

Author ORCID Identifier: NA

Affiliation Email addresses: NA

Correspondence Address: NA

Permissions & Fee and Test Year

The DUDIT was developed by a team under the auspices of Anne H. Berman, with the initial concept dating to 1992. The instrument is generally available for use without specific fees, particularly through public health resources. The official reference paper for its evaluation is Berman et al. (2005). The instrument can be found via the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA).

Reference’s

• Berman, A. H., Bergman, H., Palmstierna, T., & Schlyter, F. (2005). Evaluation of the Drug Use Disorders Identification Test (DUDIT) in Criminal Justice and Detoxification Settings and in a Swedish Population Sample. European Addiction Research, 11(1), 22-31.
• The instrument can be found at: http://www.emcdda.europa.eu/html.cfm/index10451EN.html

Items of the Drug Use Disorders Identification Test – DUDIT

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