{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T19:05:38Z","timestamp":1785524738720,"version":"3.56.0"},"reference-count":43,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T00:00:00Z","timestamp":1769385600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T00:00:00Z","timestamp":1769385600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Medical Virology"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The C19\u2010YRS was the first condition\u2010specific for long COVID\/post\u2010COVID syndrome. Although the original C19\u2010YRS evolved to the modified version (C19\u2010YRSm) based on psychometric evidence, clinical content relevance, as well as feedback from patients and healthcare professionals, it has not been validated through Rasch analysis. The study aim was to psychometrically assess and validate the C19\u2010YRSm using newly collected data from a large\u2010scale, multicenter study (LOCOMOTION). In total, 1278 patients (67% Female; mean age\u2009=\u200948.6, SD 12.7) digitally completed the C19\u2010YRSm. The psychometric properties of the C19\u2010YRSm Symptom Severity (SS) and Functional Disability (FD) subscales were assessed using a Rasch Measurement Theory framework, assessing for individual item model fit, targeting, internal consistency reliability, unidimensionality, local dependency (LD), response category functioning and differential item functioning (DIF) by age group, sex and ethnicity. Rasch analysis revealed robust psychometric properties of both subscales, with each demonstrating unidimensionality, appropriate response category structuring, no floor or ceiling effects, and minimal LD and DIF. Both subscales also displayed good targeting and reliability (SS: Person Separation Index (PSI)\u2009=\u20090.81, Cronbach's\n                    <jats:italic>\u03b1\u2009<\/jats:italic>\n                    =\u20090.82; FD: PSI\u2009=\u20090.76, Cronbach's\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2009=\u20090.81). Although some minor anomalies are apparent, the modifications to the original C19\u2010YRS have strengthened its measurement characteristics and its clinical and conceptual relevance.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial Registration:<\/jats:bold>\n                    NCT05057260, ISRCTN15022307\n                  <\/jats:p>","DOI":"10.1002\/jmv.70816","type":"journal-article","created":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T11:43:43Z","timestamp":1769427823000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Large\u2010Scale Psychometric Assessment and Validation of the Modified COVID\u201019 Yorkshire Rehabilitation Scale Patient\u2010Reported Outcome Measure for Long COVID or Post\u2010COVID Syndrome"],"prefix":"10.1002","volume":"98","author":[{"given":"Mike","family":"Horton","sequence":"first","affiliation":[{"name":"Leeds Institute of Rheumatic and Musculoskeletal Medicine University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5750-7772","authenticated-orcid":false,"given":"Adam B.","family":"Smith","sequence":"additional","affiliation":[{"name":"Leeds Institute of Rheumatic and Musculoskeletal Medicine University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruairidh","family":"Milne","sequence":"additional","affiliation":[{"name":"University of Southampton Southampton UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darren","family":"Winch","sequence":"additional","affiliation":[{"name":"Kent &amp; Medway ICB Patient Reference Group Kent UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clare","family":"Rayner","sequence":"additional","affiliation":[{"name":"LOCOMOTION Patient Advisory Group University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Halpin","sequence":"additional","affiliation":[{"name":"Leeds Institute of Rheumatic and Musculoskeletal Medicine University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rory","family":"O'Connor","sequence":"additional","affiliation":[{"name":"Leeds Institute of Rheumatic and Musculoskeletal Medicine University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roman","family":"Rocha Lawrence","sequence":"additional","affiliation":[{"name":"ELAROS 24\/7 Ltd. Sheffield UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7035-3096","authenticated-orcid":false,"given":"Darren C.","family":"Greenwood","sequence":"additional","affiliation":[{"name":"Leeds Institute for Data Analytics University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nawar D.","family":"Bakerly","sequence":"additional","affiliation":[{"name":"Northern Care Alliance Bury UK"},{"name":"Manchester Metropolitan University Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachael","family":"Evans","sequence":"additional","affiliation":[{"name":"Department of Respiratory Sciences University of Leicester Leicester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph","family":"Kwon","sequence":"additional","affiliation":[{"name":"Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Helen","family":"Dawes","sequence":"additional","affiliation":[{"name":"Medical School, NIHR Exeter Biomedical Research Centre, Faculty of Health and Life Sciences University of Exeter Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Conor","family":"Wood","sequence":"additional","affiliation":[{"name":"Birmingham Community Healthcare NHS Foundation Trust Aston UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Williams","sequence":"additional","affiliation":[{"name":"Hertfordshire Community NHS Trust Stevenage UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Harsha","family":"Master","sequence":"additional","affiliation":[{"name":"Hertfordshire Community NHS Trust Stevenage UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mae","family":"Mansoubi","sequence":"additional","affiliation":[{"name":"Medical School, NIHR Exeter Biomedical Research Centre, Faculty of Health and Life Sciences University of Exeter Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johannes H.","family":"De Kock","sequence":"additional","affiliation":[{"name":"NHS Highland COVID Recovery Service, Faculty of Health Sciences North West University Inverness UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordan","family":"Mullard","sequence":"additional","affiliation":[{"name":"Faculty of Medical Sciences Newcastle University Newcastle upon Tyne UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mike","family":"Ormerod","sequence":"additional","affiliation":[{"name":"Long Covid Support (UK Registered Charity: 1198938) London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ghazala","family":"Mir","sequence":"additional","affiliation":[{"name":"School of Medicine University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stavros","family":"Petrou","sequence":"additional","affiliation":[{"name":"Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daryl B.","family":"O'Connor","sequence":"additional","affiliation":[{"name":"School of Psychology University of Leeds Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0334-2968","authenticated-orcid":false,"given":"Manoj","family":"Sivan","sequence":"additional","affiliation":[{"name":"Leeds Institute of Rheumatic and Musculoskeletal Medicine University of Leeds Leeds UK"},{"name":"COVID Rehabilitation Service Leeds Community Healthcare NHS Trust Leeds UK"},{"name":"National Demonstration Centre of Rehabilitation Medicine Leeds Teaching Hospitals NHS Trust Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"LOCOMOTION 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