Which opioid toxicity deaths counted as shelter incidents in the Ontario coroner study?

The case definition followed the incident location

Hamzat and colleagues used Ontario coroner records to study accidental opioid toxicity deaths in which the toxicity incident occurred at a shelter. The primary analysis used conventional shelters as classified by the coroner and excluded temporary emergency hotel shelters. The defining location was the site of the toxicity incident, which can differ from the place where death was pronounced.

The definition controls what the counts describe

A shelter resident who experienced the incident elsewhere would fall outside that location-based analysis. A person transferred to hospital after a toxicity incident at a conventional shelter could still satisfy the location criterion. The counts describe deaths captured under that definition. Estimating risk per resident or shelter visit would require an appropriate population or exposure denominator.

How to use the study when reviewing a record

Keep the incident site, residence or housing status, transport destination and place of death in separate fields. Confirm whether the comparison you are making uses the same shelter categories. This helps prevent a study of selected locations from being treated as a count of every opioid toxicity death among people using shelter services.

Source paper

Read the study at PubMed Central (PMC12306205).