# Cost of acute hospital treatment and initial aftercare for hospital-presenting self-harm in Ireland: national registry study

## TL;DR

This study estimates the cost of hospital treatment for self-harm in Ireland and identifies factors that increase these costs.

## Contribution

The study provides new national cost estimates and identifies predictors of cost for self-harm hospital presentations.

## Key findings

- The average annual cost of self-harm in Ireland was approximately €26.5 million.
- Repeat self-harm presentations accounted for nearly half of the total cost.
- Psychiatric and medical admissions were associated with the highest costs.

## Abstract

Understanding the economic cost of self-harm is essential for evaluating intervention cost-effectiveness and guiding funding allocation and service planning.

To estimate the cost associated with self-harm presentations to hospital emergency departments and investigate key predictors of cost.

Data on presentations to hospital for self-harm in all Irish emergency departments were analysed for 2018 and 2019. Costs of hospital treatment following self-harm were identified (in 2019 euros) using top-down and bottom-up approaches. The perspective taken was that of the health service. Factors associated with costs were investigated using generalised linear models.

There were 25 053 self-harm presentations from 2018 to 2019. The average annual cost of self-harm was approximately €26.5 million; almost half of the total cost was due to repeat self-harm presentations (47.3%). The mean cost per presentation was €2117 (s.d. €1845), which incorporates acute hospital costs (mean €2067, s.d. €2127) and those of initial aftercare (mean €50, s.d. €69). Psychiatric and medical admissions were associated with highest costs, three times that of presentations resulting in emergency department discharge (incidence rate ratio (IRR) 3.01, 95% CI 2.72–3.36 and IRR 2.88, 95% CI 2.72–3.36, respectively). Other factors associated with higher costs included older age, emergency department medical assessment unit admission, receiving a psychosocial assessment and self-harm involving a firearm. Demographic and clinical predictors of cost varied according to care pathway.

Significant costs associated with repeat attendances and hospital admission provide evidence for investment in emergency department services providing comprehensive care for those presenting with self-harm, as well as in community-based mental health services.