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Background: Previous studies have suggested that individuals with ADHD have high scores in novelty seeking and harm avoidance. However, it is not known whether personality is associated with specific subtypes and dimensions of the disorder. The aim of this study is to test for associations between scores in the temperament and character inventory of C.R. Cloninger with adult ADHD subtypes and severity. Sampling and Methods: The diagnostic interviews of 296 adult ADHD patients followed the DSM-IV criteria. ADHD dimensions were evaluated with the SNAP-IV scores, and personality dimensions were assessed using the Temperament and Character Inventory. Results: The combined subtype (n = 168) was associated with higher scores in novelty seeking (p < 0.001) and lower scores in cooperativeness (p = 0.006) than the inattentive subtype (n = 128). Higher inattention scores were associated …