BACKGROUND A range of factors including mental disorders, adverse events and history of self-harm are associated with suicide risk. Further examination is needed of the characteristics of suicides which occur without established risk factors, using national surveillance systems.

METHODS Data on all suicides in Ireland from 2015 to 2017 were drawn from the Irish Probable Suicide Deaths Study (IPSDS). Variables examined included socio-demographics, psychiatric history and precipitant stressors. Suicide data were linked with data on prior self-harm from the National Self-Harm Registry Ireland (NSHRI). Latent Class Analysis (LCA) was used to identify sub-groups of suicide cases.

RESULTS Of the 1809 individuals who died by suicide, 401 (22.2 %) had a history of hospital-treated self-harm. Four distinct profiles of suicides were identified. One group was marked by high levels of prior self-harm and mental health conditions. Two of the groups included few individuals with a history of self-harm but had notably high levels of mental health conditions. These two groups had relatively high levels of reported chronic pain or illness but differed in terms of socio-demographics. The final group, predominantly male, had markedly low levels of mental health conditions or self-harm but high levels of personal stressors and substance use.

LIMITATIONS The use of coronial data may be limited by bias in the collecting of information from the deceased's family members.

CONCLUSIONS A sub-group of suicide cases exists without any psychiatric or self-harm history but with salient occupational or health-related proximal stressors. Suicide prevention interventions should include occupational settings and should promote mental health literacy.