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Objectives: Although typically considered a condition affecting children, scientific evidence has shown that 30–50% of those diagnosed with ADHD in childhood continue to suffer from this condition after the age of 18. This study sought to address the gap in the literature, and to describe the socio-demographic and clinical characteristics of ADHD patients in a sample of adult patients attending an outpatient clinic at a tertiary care hospital in Oman, and to evaluate their association with the different subtypes of the disorder. Methods: Data from adult patients with ADHD from the outpatient clinic at Sultan Qaboos University Hospital (SQUH), Muscat, Oman, were retrospectively collected from medical records from January 2018 to April 2020. Socio-demographic characteristics, clinical profiles and psychiatric co morbidities were examined. Results: This study included 100 adults who fulfilled the standard diagnosis of ADHD, with 54% (n=54), and 46% (n=46) from the inattentive and combined subtypes, respectively. It was found that ADHD was more prevalent among males (64.0%) compared to females (36%), with the inattentive subtype being more predominant among females. The ADHD patients with the inattentive subtype were associated with co-morbid substance use disorders (OR=11.29, P = 0.049), personality disorders (OR=7.96, P = 0.017), and major depressive disorder (OR=15.94, P = 0.002) compared to patients with the predominantly combined subtype. Conclusion: This study from Oman echoes the findings from the current literature, that adult patients with ADHD commonly have co-morbid psychiatric disorders, leading to significant functional impairment. Psychiatric co-morbidities must be identified and urgently treated, to allow for better clinical and functional outcomes in adult patients with ADHD.
Keywords: ADHD, co-morbidity, hyperactivity, Oman, psychiatry
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