Healthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England (extended data)

This dataset includes:<br><br>1. Search terms used to identify codes that may represent a history of illicit opioid use 2. Codelist for identifying people with a history of illicit opioid use 3. Age- and sex-distribution of patients by product and clinical codes 4. Number of patients currently in the cohort<br>5. Age of patients at cohort entry<br>6. Internal validation based on hospital admissions for opioid dependence