{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T19:41:06Z","timestamp":1767901266170,"version":"3.49.0"},"reference-count":32,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2013,3,1]],"date-time":"2013-03-01T00:00:00Z","timestamp":1362096000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"University of Copenhagen's Center for Healthy Aging"},{"DOI":"10.13039\/501100004825","name":"Nordea-foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100004825","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100008392","name":"Danish Medical Research Council","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100008392","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J American Geriatrics Society"],"published-print":{"date-parts":[[2013,3]]},"abstract":"\n Objectives<\/jats:title>\n To improve the construct validity of self\u2010reported fatigue by establishing a formal hierarchy of scale items and to determine whether such a hierarchy could be maintained across time (aged 75\u201380), sex, and nationality.<\/jats:p>\n <\/jats:sec>\n \n Design<\/jats:title>\n Cohort study.<\/jats:p>\n <\/jats:sec>\n \n Setting<\/jats:title>\n \n Two\n N<\/jats:styled-content>\n ordic urban locations:\n J<\/jats:styled-content>\n yv\u00e4skyl\u00e4,\n F<\/jats:styled-content>\n inland, and\n G<\/jats:styled-content>\n lostrup,\n D<\/jats:styled-content>\n enmark.\n <\/jats:p>\n <\/jats:sec>\n \n Participants<\/jats:title>\n \n Baseline (1989\/90) consisted of a random sample of citizens of\n F<\/jats:styled-content>\n inland or\n D<\/jats:styled-content>\n enmark born in 1914 (n\u00a0=\u00a0837). At 5\u2010year follow\u2010up, excluding those lost to follow\u2010up and with baseline disability resulted in a sample of n\u00a0=\u00a0690.\n <\/jats:p>\n <\/jats:sec>\n \n Measurements<\/jats:title>\n \n The\n M<\/jats:styled-content>\n obility\u2010\n T<\/jats:styled-content>\n iredness (\n M<\/jats:styled-content>\n ob\u2010\n T<\/jats:styled-content>\n ) Scale is a six\u2010item scale that requires subjects to self\u2010report on whether they become tired performing mobility\u2010related tasks. Employing item response theory, an attempt was made to enhance construct validity by confirming a hierarchy of mobility\u2010related fatigue.\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n A formal hierarchy of fatigue tasks, maintained across time, was established using the revised\n M<\/jats:styled-content>\n ob\u2010T Scale. At age 75, the scalability statistics were a homogeneity coefficient (\n \n H<\/jats:styled-content>\n )\n <\/jats:italic>\n of 0.80,\n \n of 3.9% and an\n \n H<\/jats:italic>\n T<\/jats:sup>\n <\/jats:styled-content>\n value of 0.66. The corresponding figures at age 80 were 0.75, 6.9% and 0.59. The property of invariant item ordering was maintained across subgroups based on sex and nationality.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion<\/jats:title>\n Establishing a formal hierarchy at age 75 allowed which tasks were most debilitating to be identified more clearly and the individual's \u201cdistance\u201d from these tasks to be gauged. Because it was possible to confirm that the item hierarchy was maintained across time (aged 75\u201380), researchers or clinicians can be more confident that performance over time is the result of real change and has less to do with measurement error.<\/jats:p>\n <\/jats:sec>","DOI":"10.1111\/jgs.12122","type":"journal-article","created":{"date-parts":[[2013,3,2]],"date-time":"2013-03-02T02:44:40Z","timestamp":1362192280000},"page":"429-433","source":"Crossref","is-referenced-by-count":21,"title":["Improving a Measure of Mobility\u2010Related Fatigue (The Mobility\u2010Tiredness Scale) by Establishing Item Intensity"],"prefix":"10.1111","volume":"61","author":[{"given":"Robert A.","family":"Fieo","sequence":"first","affiliation":[{"name":"Division of Neuroscience College of Physicians and Surgeons Columbia University New York New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erik L.","family":"Mortensen","sequence":"additional","affiliation":[{"name":"Department of Health Psychology Institute of Public Health University of Copenhagen Copenhagen Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taina","family":"Rantanen","sequence":"additional","affiliation":[{"name":"Department of Health Sciences Gerontology Research Center University of Jyvaskyl\u00e4 Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kirsten","family":"Avlund","sequence":"additional","affiliation":[{"name":"Section of Social Medicine Department of Public Health University of Copenhagen Copenhagen Denmark"},{"name":"Center for Healthy Aging University of Copenhagen Copenhagen Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,3]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmrj.2010.03.022"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1080\/14034940410028406"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.4140\/TCP.n.2007.566"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/gln017"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1532-5415.2008.01957.x"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/56.3.M146"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/geronj\/44.5.M141"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1093\/eurpub\/6.1.35"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/glr183"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0895-4356(02)00463-8"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/ageing\/afg101"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.3109\/11038129509106793"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1177\/014662168200600404"},{"key":"e_1_2_6_15_1","first-page":"5","article-title":"Design, material and methods in the NORA study. 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