Bipolar disorder predicted shorter and borderline personality disorder symptoms longer time to remission – A prospective cohort study of major depressive patients

•Prospective outcome study of depression in unipolar, bipolar and borderline patients•Time to remission shortest among bipolar and longest among borderline patients•Bipolar patients had the most variable illness course, but hypomanic switch was rare.•Severity of borderline features was related to longer time to remission.•Assessment of borderline features among depressive patients may be clinically useful.