{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T18:19:40Z","timestamp":1787163580278,"version":"build-2736575974"},"reference-count":43,"publisher":"BMJ","issue":"12","license":[{"start":{"date-parts":[[2021,12,21]],"date-time":"2021-12-21T00:00:00Z","timestamp":1640044800000},"content-version":"unspecified","delay-in-days":20,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/100001275","name":"Oak Foundation","doi-asserted-by":"publisher","award":["OCAY-18-774-OFIL"],"award-info":[{"award-number":["OCAY-18-774-OFIL"]}],"id":[{"id":"10.13039\/100001275","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100008368","name":"Danish Rheumatism Association","doi-asserted-by":"crossref","award":["R167-A5693"],"award-info":[{"award-number":["R167-A5693"]}],"id":[{"id":"10.13039\/100008368","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Frederiksberg Hospital","award":["No funding number available"],"award-info":[{"award-number":["No funding number available"]}]},{"name":"Minister Erna Hamilton foundation","award":["J.nr. 21-2020"],"award-info":[{"award-number":["J.nr. 21-2020"]}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2021,11,24]]},"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The association between chronic widespread pain (CWP) and disability is well established. Although research support large interindividual differences in functional outcomes, limited studies are available on the socio-economic consequences of offering stratified treatment based on prognostic factors. Identification of predictors of long-term functional outcomes such as work disability as a critical consequence, could assist early and targeted personalised interventions. The primary objective of this cohort study is to identify prognostic factors for the primary endpoint work status (employed and working vs not working) in patients with CWP assessed 3 years from baseline, that is, at referral for specialist care.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and analyses<\/jats:title>\n                    <jats:p>\n                      Data are collected at the diagnostic unit at Department of Rheumatology, Frederiksberg Hospital. The first 1000 patients\n                      <jats:bold>\u2265<\/jats:bold>\n                      18 years of age registered in a clinical research database (DANFIB registry) with CWP either \u2018employed and working\u2019 or \u2018not working\u2019 will be enrolled. Participants must meet the American College of Rheumatology 1990 definition of CWP, that is, pain in all four body quadrants and axially for more than 3 months and are additionally screened for fulfilment of criteria for fibromyalgia. Clinical data and patient-reported outcomes are collected at referral (baseline) through clinical assessment and electronic questionnaires. Data on the primary endpoint work status at baseline and 3 years from baseline will be extracted from the Integrated Labour Market Database, Statistics Denmark and the nationwide Danish DREAM database. Prognostic factor analysis will be based on multivariable logistic regression modelling with the dichotomous work status as dependent variable.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Ethics and dissemination<\/jats:title>\n                    <jats:p>Sensitive personal data will be anonymised according to regulations by the Danish Data Protection Agency, and informed consent are obtained from all participants. Understanding and improving the prognosis of a health condition like CWP should be a priority in clinical research and practice. Results will be published in international peer-reviewed journals.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial registration number<\/jats:title>\n                    <jats:p>\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" xlink:href=\"NCT04862520\">NCT04862520<\/jats:ext-link>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2021-052919","type":"journal-article","created":{"date-parts":[[2021,12,22]],"date-time":"2021-12-22T12:06:31Z","timestamp":1640174791000},"page":"e052919","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Prognostic factors for work disability in patients with chronic widespread pain and fibromyalgia: protocol for a cohort study"],"prefix":"10.1136","volume":"11","clinical-trial-number":[{"clinical-trial-number":"nct04862520","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8729-0634","authenticated-orcid":false,"given":"Pernille H","family":"Duhn","sequence":"first","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Rheumatology, Frederiksberg Hospital, Frederiksberg, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henning","family":"Locht","sequence":"additional","affiliation":[{"name":"Rheumatology, Frederiksberg Hospital, Frederiksberg, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva Ejlersen","family":"W\u00e6hrens","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Occupational Science & Occupational Therapy, User Perspectives and Community-Based Research, Department of Public Health, University of Southern Denmark, Odense, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin","family":"Christensen","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Research Unit of Rheumatology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karsten","family":"Thielen","sequence":"additional","affiliation":[{"name":"Department of Social Medicine, University of Copenhagen, Kobenhavn, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marius","family":"Henriksen","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars Erik","family":"Kristensen","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Rheumatology, Frederiksberg Hospital, Frederiksberg, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henning","family":"Bliddal","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Clinical Medicine, University of Copenhagen, Kobenhavn, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirstine","family":"Amris","sequence":"additional","affiliation":[{"name":"Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark"},{"name":"Rheumatology, Frederiksberg Hospital, Frederiksberg, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2021,12,22]]},"reference":[{"key":"2025101814570702000_11.12.e052919.1","doi-asserted-by":"crossref","first-page":"389","DOI":"10.2147\/JPR.S55388","article-title":"Costs of moderate to severe chronic pain in primary care patients - 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