Australia
Study identifies diagnostic inconsistencies in Australian mental health substance use records
This retrospective analysis evaluated electronic health records from 58,724 Australian psychiatric patients over four years. Researchers found that over a third of individuals had documented substance use issues, with cannabinoids frequently identified. However, the study highlighted a significant lack of diagnostic specificity, noting that clinicians frequently relied on vague categories rather than identifying specific substances.
- Approximately 34.4% of the evaluated mental health patients had a recorded substance use disorder.
- Cannabinoids, nicotine, alcohol, and non-cocaine stimulants were the most common specific substance classes recorded.
- Diagnostic practices frequently lacked specificity, often overusing the category of multiple and other drug use.
Our view
Diagnostic records are the raw material for most claims made about cannabis and mental health. If a third of patients carry a substance use diagnosis but the most frequently recorded class is 'multiple and other drug use', the underlying data cannot support fine-grained conclusions about any single substance, cannabis included. We read this as a caution about the quality of the evidence base rather than a finding about cannabis, and as an argument for better coding practice before policy is built on these figures.
Sources
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