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In a retrospective cohort study from Canada, Dr Mary Kennedy and colleagues explore the effect of discontinuation and tapering of prescribed opioids on risk of overdose among people on long-term opioid therapy for pain with and without opioid use disorder.

In a retrospective cohort study from Canada, Dr Mary Kennedy and colleagues explore the effect of discontinuation and tapering of prescribed opioids on risk of overdose among people on long-term opioid therapy for pain with and without opioid use disorder.

Abstract BACKGROUND: New case-mix tools from the Canadian Institute for Health Information offer a novel way of exploring the prevalence of chronic disease and multimorbidity using diagnostic data. We took a comprehensive approach to determine whether the prevalence of chronic disease and multimorbidity has been rising in Ontario, Canada. METHODS: In this observational study, we applied case-mix methodology to a population-based cohort. We used 10 years of patient-level data (fiscal years 2008/...