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A score &lt;3 was considered feasible, for the two items that assessed respondent burden a higher score indicated lesser participant burden and a score &gt;3 was feasible. Recruitment was assessed by participation rates at baseline and retention at the 1-year follow-up, with threshold values for feasibility at 75% and 80%, respectively. Data collection and outcome measures were examined by completions rates of study procedures (90% was considered feasible), sample scores, internal consistency (\u03b1&gt;0.70 was considered feasible), and agreement between self-reported data and data retrieved from medical records on opioid use (ICC or \u03ba&gt;0.60 was considered feasible).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Acceptability for study procedures was feasible, but participation rates were low: 25%. The retention rate at 1-year follow-up was 81% for those included in the feasibility study, that is, filling out computerised patient-reported outcome measures, and 65% for those using paper and pencil format. The completion rates for the different data collection methods ranged from 83% to 95%. Agreement between self-reported opioid use and prescribed dose and between opioid use disorder according to Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), and clinical International Classification of Diseases-10 (ICD-10) diagnoses for opioid dependence were almost perfect (\u03ba=0.91\u2009and \u03ba=0.90, respectively).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This feasibility study has helped to explore and improve methods for recruitment, data collection and use of outcome measures for the U-PAIN cohort. Low participation rate and high refusal rate at baseline is a challenge that needs to be further addressed.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bmjopen-2022-062265","type":"journal-article","created":{"date-parts":[[2022,12,14]],"date-time":"2022-12-14T14:56:00Z","timestamp":1671029760000},"page":"e062265","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["U-PAIN cohort study among patients with chronic pain in specialised pain care: a feasibility 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