Abstract
Opioid use disorder (OUD) is a leading cause of preventable mortality amongst young people worldwide. Early identification and intervention of modifiable risk factors may reduce future OUD risk. The aim of this study was to explore whether the onset of OUD is associated with preexisting mental health conditions such as anxiety and depressive disorders in young people. A retrospective, population-based case-control study was conducted from 31 March 2018 until 01 January 2002. Provincial administrative health data were collected from Alberta, Canada. Individuals 18-25 years on 01 April 2018, with a previous record of OUD. Individuals without OUD were matched to cases, on age/sex/index date. Conditional logistic regression analysis was used to control for additional covariates (e.g., alcohol-related disorders, psychotropic medications, opioid analgesics, and social/material deprivation). We identified N= 1848 cases and N= 7392 matched controls. After adjustment, OUD was associated with the following preexisting mental health conditions: Anxiety disorders, aOR=2.53 (95% CI=2.16-2.96); depressive disorders, aOR=2.20 (95% CI=1.80-2.70); alcohol-related disorders, aOR=6.08 (95% CI, 4.86-7.61); anxiety and depressive disorders, aOR=1.94 (95% CI=1.56-2.40); anxiety and alcohol-related disorders, aOR=5.22 (95% CI=4.03-6.77); depressive and alcohol-related disorders, aOR=6.47 (95% CI=4.73-8.84); anxiety, depressive and alcohol-related disorders, aOR=6.09 (95% CI=4.41-8.42). Preexisting mental health conditions such as anxiety and depressive disorders are risk factors for future OUD in young people. Preexisting alcohol-related disorders showed the strongest association with future OUD and demonstrated an additive risk when concurrent with anxiety/depression. As not all plausible risk factors could be examined, more research is still needed.
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