Estimation of the prevalence of adult attention-deficit/hyperactivity disorder (ADHD) in a sample of cocaine users treated in a therapeutic community and evaluation of the usefulness of Barkley executive function symptoms in differentiating cocaine-dependent patients with and without ADHD.
A transversal observation design was used. A total of 70 cocaine-dependent subjects who were admitted for treatment in a therapeutic community were assessed. Non-random consecutive sampling was used, recruiting the subjects as they arrived at the therapeutic community and met the selection criteria. Subjects included in the study were given an appointment for a face-to-face interview from 15 to 20 days after admission. The measurement instrument used for diagnosing adult ADHD was Conners鈥?Adult ADHD Diagnostic Interview for DSM-IV (CAADID). Comorbid psychiatric disorders were evaluated according to DSM-IV-TR criteria using the Spanish version of the Psychiatric Research Interview for Substance and Mental Disorders (PRISM-IV). For assessment of the 鈥渆xecutive function鈥? we used the Current Behavior Scale Self-Report by Russell A. Barkley.
The prevalence of ADHD observed in our sample was 14.3%(confidence interval [CI] 95%: 6.1-22.5). The mean scores on all the items on the Barkley scale are higher in the group of cocaine-dependent patients diagnosed with ADHD than for subjects who were cocaine-dependent only by a statistically significant difference.
The high prevalence of ADHD observed in our sample was within the range found by other authors in similar samples. The study data support Barkley's theory in this population.