• Marielle P Jans, Vera C Slootweg, Cecile R Boot, Natalie A de Morton, Geert van der Sluis, and Nico L van Meeteren.
• TNO Healthy Living, Leiden, The Netherlands. marielle.jans@hu.nl
• Arch Phys Med Rehabil. 2011 Nov 1; 92 (11): 1892-9.

ObjectiveTo examine the reproducibility, construct validity, and unidimensionality of the Dutch translation of the de Morton Mobility Index (DEMMI), a performance-based measure of mobility for older patients.DesignCross-sectional study.SettingRehabilitation center (reproducibility study) and hospital (validity study).ParticipantsPatients (N=28; age >65y) after orthopedic surgery (reproducibility study) and patients (N=219; age >65y) waiting for total hip or total knee arthroplasty (validity study).InterventionNot applicable.Main Outcome MeasuresNot applicable.ResultsThe intraclass correlation coefficient for interrater reliability was high (.85; 95% confidence interval, 71-.93), and minimal detectable change with 90% confidence was 7 on the 100-point DEMMI scale. Rasch analysis identified that the Dutch translation of the DEMMI is a unidimensional measure of mobility in this population. DEMMI scores showed high correlations with scores on other performance-based measures of mobility (Timed Up and Go test, Spearman r=-.73; Chair Rise Time, r=-.69; walking test, r=.74). A lower correlation of .44 was identified with the self-report measure Western Ontario and McMaster Universities Osteoarthritis Index.ConclusionsThe Dutch translation of the DEMMI is a reproducible and valid performance-based measure for assessing mobility in older patients with knee or hip osteoarthritis.Copyright © 2011 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.

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