Objective: Motivation is a widely used concept in substance use treatment, which is related to the change during treatment. The Drug Use Disorders Identification Test–Extended (DUDIT-E) is one of the instruments to measure motivation. Among clients who have been screened already for drug-related problems, DUDIT-E maps the frequency of illicit drug use (D), the positive (P) and negative (N) aspects of drug use, and treatment readiness (T). The aim of the present study was to evaluate the psychometric properties of the Turkish DUDIT-E in adult male patients with substance use disorder (SUD) in Turkey.
Methods: We examined the psychometric characteristics of this instrument in a population of outpatients with SUD and who are under probation (n = 196). The participants were administered the Drug Use Disorders Identification Test (DUDIT), the DUDIT-E, and the Addiction Profile Index (API).
Results: Cronbach’s alpha coefficient was 0.96 for P score, 0.95 for N score, and 0.85 for T score. Principal component analysis supported construct validity for P, N, and T scores. The DUDIT-E subscales were mild to moderately correlated with the DUDIT and the API.
Conclusions: The findings showed that the Turkish version of the DUDIT-E, when used together with the DUDIT, could effectively identify substance use problems in outpatients with SUD who are under probation.