A large adjusted association is not the same as an absolute risk or a proven drug cause.

What the paper found

A Taiwanese case-control study linked recent hypnotic use with adverse respiratory events in COPD. Active benzodiazepine exposure, defined by a recent prescription window, was associated with substantially higher adjusted event odds.

What the evidence cannot establish

Claims data cannot fully capture ingestion, COPD severity or symptoms prompting treatment. The outcome combined several respiratory conditions, and residual confounding or reverse causation may contribute.

Implications for forensic review

Specify the exposure window and event definition before quoting an estimate. An odds ratio cannot be applied as a person’s probability of respiratory arrest. Individual analysis requires respiratory reserve, other depressants, illness trajectory and the timing of actual administration.

Source and related reading

Source: PMC4504567, supplied full-text paper. Findings are paraphrased; case-review implications are an interpretation.

Related: Forensic Toxicology: expert analysis and case review.