NEO Five-Factor Inventory (NEO-FFI) personality scores (t scores) in an independent sample of 203 individuals with mood disorders: bipolar disorder (, all n=111); major depressive disorder (–■–, all n=92). Values are means, with standard errors represented by vertical bars. —, Population mean=50 (s.d.=10) (Costa & McCrae, 1992). N, Neuroticism; E, extraversion; O, openness to experience; A, agreeableness; C, conscientiousness. Groups differ only in O (t=−2.12, df=202, p=0.02).