Positive and negative affect, emotion regulation and self-efficacy are important mechanisms in borderline personality disorder (BPD), but their contribution is still not clear. Our goal was to explore their role in relation to typical BPD outcomes: psychiatric hospitalizations, suicidal behaviors and depression. The sample comprised 88 women with BPD. The unique contribution of positive and negative affect, the regulation of emotions and self-efficacy in outcomes were analyzed. Positive (β= -.40, p< .001) and negative (β= .54, p< .001) affect contributed uniquely to depression. Emotion suppression was the only predictor of the number of hospitalizations (β= -.29, p<.05). Self-efficacy was uniquely related to suicide attempts (β= -.26, p< .05) when controlling the rest of the variables. Positive and negative affect, emotion regulation and selfefficacy are important psychological mechanisms uniquely associated with specific emotional and behavioral outcomes in BPD. These findings will help to design interventions in a more effective way and tailor treatments for individuals with this disorder. [ABSTRACT FROM AUTHOR]