{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T16:21:07Z","timestamp":1790266867945,"version":"4.1.0"},"reference-count":20,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2010,10,29]],"date-time":"2010-10-29T00:00:00Z","timestamp":1288310400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Physiotherapy Res Intl"],"published-print":{"date-parts":[[2011,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Background.<\/jats:bold>\u2002The de Morton Mobility Index (DEMMI) is an instrument that accurately measures the mobility of older people across clinical settings.\u2002<jats:bold>Purpose.<\/jats:bold>\u2002To report the multiple reliability studies conducted during the development and validation of the DEMMI.\u2002<jats:bold>Methods.<\/jats:bold>\u2002Intra\u2010rater and inter\u2010rater reliability studies were conducted for the DEMMI in two independent samples (development and validation samples) of older acute medical patients (aged 65 years or older). Inter\u2010rater reliability studies were conducted between the test developer (a physiotherapist) and another experienced physiotherapist. Order of assessor administration was randomized by a coin toss. Patients who were fatigued after the first assessment were excluded from the inter\u2010rater reliability study. Intra\u2010rater reliability studies included participants with \u2018unchanged\u2019 mobility status between hospital admission and discharge. Scale reliability estimates were expressed as the minimal detectable change with 90% confidence (MDC<jats:sub>90<\/jats:sub>). Item reliability was calculated using Kappa statistics and absolute percentage agreement.\u2002<jats:bold>Results.<\/jats:bold>\u2002The MDC<jats:sub>90<\/jats:sub> for the DEMMI development sample was 9.51 points (95% confidence interval [95% CI], 5.04\u201313.32; <jats:italic>n<\/jats:italic> = 21) and 7.84 (95% CI, 4.34\u201311.65; <jats:italic>n<\/jats:italic> = 16) on the 100\u2010point interval DEMMI scale for the inter\u2010rater and intra\u2010rater reliability studies, respectively. Similar estimates were obtained for the DEMMI validation samples of 8.90 (95% CI, 6.34\u201312.69; <jats:italic>n<\/jats:italic> = 35) and 13.28 points (95% CI, 8.08\u201320.87; <jats:italic>n<\/jats:italic> = 19). Items were not excluded from the DEMMI based on the results of item reliability.\u2002<jats:bold>Conclusion.<\/jats:bold>\u2002Reliability estimates for the DEMMI were consistent across independent samples of older acute medical patients using different reliability study methodology. Error represents approximately 9% of the DEMMI scale width. 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