Harned et al. studied 94 patients with borderline personality disorder who had attempted suicide with the past year. One group had a comorbid diagnosis of PTSD (N=53) and the other did not (N=41). These two groups were compared in relation to 1) the severity of the borderline personality disorder, 2) the characteristics of trauma history, 3) elements of suicidal and nonsuicidal self-injury, 4) comorbid axis I disorders, 5) comorbid axis II disorders, 6) emotional regulation and expressivity, 7) psychosocial functioning, 8) mental health treatment utilization, and 9) medical treatment utilization. Differences between the two groups occurred in the fields of lethality, intent, triggers, trauma history, emotional regulation, and axis I comorbidity.