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Substance use disorder (SUD) is often considered a chronic illness in which prolonged recovery, in terms of abstinence, is uncommon. Personality has been found to predict recovery, but not much is known about its long-term predictive ability as the majority of previous studies have had short follow-up periods (≥ one year). The current longitudinal cohort study therefore investigated whether personality traits predict short- (STR) as well as long-term recovery (LTR) in SUD patients.

Treatment-seeking patients with SUD (n = 123) completed the NEO Personality Inventory – Revised. STR and LTR categories were defined as scoring <8 on the Alcohol Use Disorders Identification Test – C and <2 on the Drug Use Disorder Identification Test – C at the one-year and 6–8-year follow-up, respectively. Whether personality traits predicted outcome was investigated by two-tailed independent samples t …