Long-term cohort mortality and the cause of one acute death are different questions.
What the supplied paper reports
A South Korean population study matched benzodiazepine users and nonusers and used time-dependent regression. It reported a modestly higher five-year all-cause mortality hazard among users, with prescription-based exposure definitions.
Study limits
Important physiological and clinical variables were unavailable, and matching cannot remove all confounding. The outcome included deaths from many causes rather than isolated acute benzodiazepine poisoning.
Forensic implications
Keep the time horizon and outcome explicit. A hazard ratio is not a blood-concentration threshold or an individual probability of overdose. For a death investigation, clinical course, toxicology, pathology and co-exposures are needed before connecting a population association to case-specific causation.
Source and related reading
Source: PMC8149930, supplied full-text paper. Findings are paraphrased; forensic implications are an interpretation.
Related: A Mixed Midazolam–Propofol Comparison Cannot Identify Midazolam’s Independent Mortality Effect.
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