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Background:  Impulsivity as a trait characteristic is increased in bipolar disorder and may be a core factor of the illness. We have investigated relationships between trait‐like impulsivity, measured by the Barratt Impulsiveness Scale (BIS‐11), and demographic and illness‐course characteristics of bipolar disorder.

Methods:  We studied 114 subjects with bipolar disorder and 71 healthy comparison subjects. Diagnoses were based on the Structured Clinical Interview for DSM‐IV. In addition to impulsivity, we examined age, education, gender, psychiatric symptoms, and characteristics related to course of illness. We used general linear mixed model analysis to evaluate the manner in which the variables contributed to BIS‐11 scores.

Results:  All BIS‐11 subscale scores were higher in bipolar disorder than in comparison subjects. There were less consistent independent effects of education and age. Elevated BIS‐11 …