The role of childhood trauma in differences in affective instability in those with personality disorders.

BACKGROUND This study examined the relationship of self-reported histories of childhood trauma to measures of affective instability in a sample of unmedicated outpatients with various personality disorders (n=174). METHODS Childhood trauma was measured by the Childhood Trauma Questionnaire. Affective instability comprises at least two dimensions: affective lability, assessed using the Affective Lability Scale, and affective intensity, assessed using the Affective Intensity Measure. RESULTS A history of emotional abuse was the only trauma variable that significantly correlated with the affect measures in the total sample (r=.21-.30). More fine-grained analyses revealed that the relationship of emotional abuse and affective instability measures varied as a function of both gender and personality disorder type. In subjects with borderline personality disorder, the correlation for emotional abuse was greatly attenuated for both Affective Lability Scale (r=.10) and Affective Intensity Measure (r=.15) total scores. CONCLUSION This suggests that nontrauma-related factors may be more predominant in affective dyscontrol in individuals with borderline personality disorder.