Background: Attention-Deficit/Hyperactivity Disorder (ADHD) is a prevalent neurodevelopmental disorder in children and adults. Many ADHD patients experience affective symptoms that resemble the cyclothymic temperament trait, which is suggested to be a part of the bipolar spectrum. However, the relationship between adult ADHD and cyclothymic temperament has never been systematically studied.
Methods: A sample of 586 clinically diagnosed Norwegian adult ADHD patients and 721 population derived controls responded to the 21-item cyclothymic subscale of the Temperament Evaluation of Memphis, Pisa, Paris and San Diego auto-questionnaire (TEMPS-A). Self-reported data on psychiatric symptoms, comorbidity, educational and occupational level, and known comorbidity in family members, including bipolar disorder, was also obtained.
Results: The mean TEMPS-A scores were 13.0 for patients and 4.6 for controls (p<0.001), and 71% of the patients compared to 13% of the controls were classified as having a cyclothymic temperament (TEMPS score ≥11 points). Among ADHD patients, cyclothymic temperament was strongly associated with more childhood and adult ADHD symptoms, lower educational and occupational achievements and increased psychiatric comorbidity, including bipolar disorder (10%). In addition, 49% screened positive on the Mood Disorder Questionnaire.
Limitations: Although the cyclothymic TEMPS-A scale has been used in clinical settings in Norway for many years, it has not yet been officially validated.
Conclusions: Cyclothymic temperament is highly prevalent in adults with ADHD, and this characterises a subgroup of more psychiatrically impaired individuals, possibly reflecting an underlying affective instability with a pathophysiology closer to the bipolar spectrum disorders.
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