{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,25]],"date-time":"2025-05-25T20:40:02Z","timestamp":1748205602908,"version":"3.41.0"},"reference-count":15,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"4","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:p>The aim of this study was to detect a possible age-related differential item functioning (DIF) of the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0) among people with musculoskeletal disorders. This was a cross-sectional study of 1739 consecutive patients with chronic musculoskeletal pain at a university clinic. Difficulty and discrimination parameters were calculated for each of 12 items of the WHODAS 2.0 using item response theory. The presence of DIF was assessed both numerically and graphically. When considering differences in both difficulty and discrimination, a statistically significant DIF was observed for all the items except for the item \u2018washing\u2019 (<jats:italic toggle=\"yes\">P<\/jats:italic> values &lt;0.001). The DIF was mostly uniform. Items \u2018standing\u2019, \u2018household responsibilities\u2019, \u2018learning a new task\u2019, \u2018emotional affectedness\u2019, \u2018concentrating\u2019, \u2018washing\u2019 and \u2018dressing\u2019 showed better precision among older patients. Items \u2018walking\u2019, \u2018dealing with strangers\u2019, \u2018maintaining a friendship\u2019 and \u2018day-to-day work\u2019 were more informative among younger patients. Difficulty and discrimination parameters were alike for all 12 items. The DIF was mostly uniform. These results can be taken into account when applying the WHODAS 2.0 to people with musculoskeletal complaints, especially when the studied groups are predominated by people of certain age.<\/jats:p>","DOI":"10.1097\/mrr.0000000000000645","type":"journal-article","created":{"date-parts":[[2024,10,2]],"date-time":"2024-10-02T07:00:30Z","timestamp":1727852430000},"page":"276-281","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":0,"title":["Age-related differences in psychometric properties of World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0): a retrospective analysis"],"prefix":"10.1097","volume":"47","author":[{"given":"Mika","family":"Karsikas","sequence":"first","affiliation":[{"name":"Medical School, Department of Clinical Medicine, University of Turku"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mikhail","family":"Saltychev","sequence":"additional","affiliation":[{"name":"Department of Physical and Rehabilitation Medicine, Turku University Hospital and University of Turku, Turku, Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juhani","family":"Juhola","sequence":"additional","affiliation":[{"name":"Department of Physical and Rehabilitation Medicine, Turku University Hospital and University of Turku, Turku, Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","published-online":{"date-parts":[[2024,10,29]]},"reference":[{"key":"R1-20250525","doi-asserted-by":"crossref","first-page":"316","DOI":"10.1097\/MRR.0000000000000365","article-title":"Gender-related differences in psychometric properties of WHO Disability Assessment Schedule 2.0.","volume":"42","author":"Katajapuu","year":"2019","journal-title":"Int J Rehabil 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