Development of the modified elderly mobility scale (MEMS) : its reliability and validity for community elderly

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Development of the modified elderly mobility scale (MEMS) : its reliability and validity for community elderly


Author: Leung, Yun-fai Albert
Title: Development of the modified elderly mobility scale (MEMS) : its reliability and validity for community elderly
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Older people -- China -- Hong Kong -- Physiology
Older people -- Health and hygiene -- China -- Hong Kong
Physical therapy for older people
Human mechanics
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: xi, 95 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: The purpose of this study is to develop a simple but valid and reliable assessment tool, Modified Elderly Mobility Scale (MEMS), which is clinically relevant in Hong Kong for assessing the functional mobility of community elderly. The Elderly Mobility Scale, which is the most commonly used instrument in Hong Kong nowadays, has been found to be valid and reliable for mainly frail hospitalized patients only. Due to this reason and its psychometric properties revealed in some previous studies, limit its clinical uses in geriatricre habilitation. The new scale (MEMS) added some new items and modified some others. Evidence was gathered to test its validity and reliability. The proposed version of MEMS was sent to experienced community health care professionals for comments and finalized by a expert panel of physiotherapists. Totally 104 community elderly were randomly selected from the clients attending either the out-patient adult unit (n=50) or geriatric day hospital(n=54) and MEMS were administrated. Inter-rater reliability was established by having 5 trained raters rating the videotaped performance of 12 elderly attending the out-patient adult unit. The result was analyzed by ICC(2,1) with a high reliability ranging from 0.806 - 1.000. Test-retest reliability was estimated by the same 5 trained raters administrating the MEMS twice within 2 weeks interval to the above 12 video-taped elderly. The result was analyzed by ICC(l,l) with a very high reliability ranging from 0.886 - 1.000. In addition, independent sample t-test showed the patient data of the two units was homogeneous in variance and mean so that we can combine the data for further analysis. High internal consistency of MEMS items was demonstrated with high overall Cronbach's alpha (0.954)and moderately high inter-item correlation values ranging from 0.467 - 0.891. Further item analysis revealed good item discrimination power with the discrimination index ranging from 0.604 - 0.905. Item difficulty index, on the other hand, ranged from 0.313 - 0.817. Construct validity in terms of factor analysis was used and found that only one single factor was extracted (mobility construct) contributing to 74.3 % of variance. Concurrent validity by Pearson's correlation coefficient was examined for 41 elderly receiving intervention in geriatric day hospital. Very significant correlations (sig.<0.01) were found between MEMS scores and the EMS (0.975) or modified Barthel Index-100 (0.878). Some modifications of the present items are suggested to further improve the validity of the scale and its further clinical usage, for example, the predictive power should be studied. Based on the present findings, MEMS is concluded as valid and reliable in assessing functional mobility of community elderly patients. Its implementation in geriatric care should be encouraged and promoted.

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