Suicidal ideation, suicide attempts and non-suicidal self-injury among lesbian, gay, bisexual and heterosexual adults: Findings from an Australian national study

Objectives: This study investigated associations between sexual orientation and measures of suicidality and non-suicidal self-injury in Australian adults. Previous studies of sexual orientation and suicidality have been limited by unclear conceptualisations of suicidal intent, failure to differentiate between homosexuality and bisexuality, inattention to gender differences and use of convenience-based samples. Methods: A large (N = 10,531) representative national sample of Australian adults was used to investigate associations between sexual orientation (heterosexual, homosexual, bisexual) and (1) suicidal ideation, (2) attempted suicide and (3) non-suicidal self-injury, for males and females separately, in a series of sequentially adjusted logistic regression models. Results: Sexual minority participants were at greater risk of suicidality and self-injury than heterosexuals, after adjusting for age and other covariates, with patterns of risk differing by sexual orientation and gender. Compared with their heterosexual counterparts, gay men, but not bisexual men, were more likely to report suicidal ideation (odds ratio = 3.05, 95% confidence interval = [1.65, 5.60]) and suicide attempts (odds ratio = 4.16, confidence interval = [2.18, 7.93]). Bisexual women, but not lesbian women, were more likely to report suicidal ideation (odds ratio = 4.40, confidence interval = [3.00, 6.37]) and suicide attempts (odds ratio = 4.46, confidence interval = [2.41, 8.24]). Neither bisexual nor gay men were more likely than heterosexual men to report self-injury. However, bisexual women, but not lesbian women, were more likely than heterosexual women to report self-injury (odds ratio = 19.59, confidence interval = [9.05, 42.40]). Overall, bisexual females were at greatest risk of suicidality and self-injury. Conclusion: Clinicians working with sexual minority populations are encouraged to openly discuss suicidal and self-injurious thoughts and behaviours with their clients and may consider using therapeutic strategies to reduce internalised stigma and enhance personal and social resources.