The original sample included over 40,000 adults, and 2,422 met criteria for DSM-IV current major depressive disorder. Three years later, 1,996 of the original currently depressed subjects were available for reinterviewing, which makes both a respectable sample size and response rate for generalizability. However, some caution is needed, since the sample was over-represented with Caucasian, college-educated, and married respondents. Fifteen percent of participants had persistent major depressive disorder, and 7.3% of those who remitted had a recurrence over the follow-up period. These figures are within the range of longitudinal studies of patients with major depressive disorder (2). While the presence of any personality disorder elevated the risk for persistence of major depressive disorder, when all axis I and II disorders, age of onset of major depressive disorder, number of previous episodes, family history, treatment, and duration of illness were controlled, borderline personality disorder remained the most robust predictor of major depressive disorder persistence. Neither personality disorders nor other clinical variables predicted recurrence of major depressive disorder. Thus, an epidemiologic survey yielded a practical jewel. The finding, undoubtedly, does not surprise the clinician but is now confirmed nationally. As the authors conclude, borderline personality disorder should be assessed in all depressed patients and considered in prognosis and addressed in treatment.