Factors associated with mental health representations to the emergency department within six months.

BACKGROUND/OBJECTIVE: ED representation places a tremendous drain on resources with mental health (MH) representation among the most common. This study aimed to identify patient and clinical factors associated with 28-day and six-month ED MH representation of an index MH ED presentation.

METHOD: All MH related ED presentations from 1 January 2017 to 30 June 2019 were extracted from routinely collected administrative data. Cox regression and multinomial logistic regression models tested associations between patient characteristics and risk of representation.

RESULTS: For the 8,010 patients, 28-day and six-month representations were 8 % and 16 % respectively. Self-identifying with a MH problem at index presentation (28-day hazard ratio (HR) = 1.48, 95 % CI = 1.19-1.84; six-month HR = 1.52, 95 % CI = 1.29-1.78), leaving ED before completing treatment (28-day HR = 4.13, 95 % CI = 3.36-5.08; six-month HR = 2.52, 95 % CI = 2.12-2.99), no private health insurance (six-month HR = 1.34, 95 % CI = 1.08-1.66), and hospital admission within one year prior to index (six month MH-related admission vs non-MH, HR = 1.59, 95 % CI = 1.19-2.13) were associated with increased risk of representation. Being uninsured was associated with frequent six-month representation among adults aged 16-39 years (OR = 3.16, 95 %CI = 1.59-6.25).

CONCLUSION: Self-identifying with a MH problem, leaving ED prematurely, being uninsured and prior hospitalisation are areas for in-depth investigation for improved understanding of unplanned representations.