Ose SO, Tveit T, Mehlum L., et al. - Among adult psychiatric outpatients, researchers sought to determine the prevalence of non-suicidal self-injury (NSSI) and its correlation with suicide ideation (SI) and suicide attempts (SA). This study was particularly focused on patients with personality disorders vs patients with other disorders. Data on all available patients in all outpatient psychiatric clinics in Norway were obtained over a 14-day period. Employing this national clinical unselected cross-sectional dataset from 23,124 outpatients, they produced proportional Venn diagrams of the prevalence of NSSI, SI and SA and their co-occurrence over the previous 4 weeks. During this time, at least one episode of NSSI was reported for 8.1% of the patients, SI was reported by 17.3%, and at least one SA was made by 0.6% of the patients. Compared to patients without NSSI behavior, SA was more than seven times higher among patients with NSSI behavior. A significantly higher prevalence of SI, NSSI, and NSSI with co-occurring SI was seen in patients with a diagnosis of personality disorder vs all other diagnostic groups; they were not systematically different from patients with other diagnoses in their prevalence of NSSI without co-occurring SI. Even when controlling for socio-demographic variables, these findings remained statistically significant. Although all diagnostic groups show co-occurrence of NSSI and SI, both NSSI and SI appear alone more frequently than together. As NSSI and SA are strongly correlated, they emphasize a more proactive focus on NSSI behavior in mental health clinical settings as an important suicide preventive measure.