Self-poisoning in young Australians: The impact of COVID-19 and recent trends following easing of restrictions.

Introduction: Self-poisoning is the most common form of hospitalised self-harm in young people and has been increasing over the last decade. The COVID-19 pandemic was associated with further increases in self-harm in adolescents. There are limited data on changes after pandemic restrictions ended. This study aimed to describe recent trends in self-poisoning in young people.

Setting: Australia 2018-2023.

Methods: A retrospective analysis of self-poisoning calls to Australia's poisons information centres. Intentional poisoning exposures in people aged 5-19 years were included in the main analysis. We also examined intentional poisonings in people aged 20 and over for comparison. We used interrupted time-series analysis to estimate the impact of COVID-19 (March 2020) and 're-opening' (December 2021), when many restrictions were lifted in Australia. We compared effects in the jurisdictions with most disruptions and lockdowns with other jurisdictions.

Results: There were 201,755 self-poisonings documented, 64% female, with 19,946 children (aged 5-14, 9.9%) and 44,388 adolescents (aged 15-19, 22.0%). There was a steep increase in the rate of poisoning in female children and adolescents - with the annual increase being 1.361 (95% confidence interval = [1.074, 1.735]) and 1.154 (95% confidence interval = [1.049, 1.283]) times faster than pre-pandemic trends in these two groups between March 2020 and December 2021. Following relaxation of restrictions, there was a sudden drop and then slow decline in self-poisonings (despite rising COVID-19 infection rates). There was an overall 29.6% increase in intentional poisonings in young people over the study period. This is markedly more pronounced among young females (37.0%) vs males (11.2%). There were substantial jurisdictional variations, with larger increases in Victoria, Tasmania and the Australian Capital Territory.

Conclusion: There has been a marked increase in child and adolescent female self-poisonings over the last 6 years, with increases strongly associated with COVID-19 pandemic restrictions but persisting after their removal.