The validation of the Hong Kong Chinese version of the Lawton Instrumental Activities of Daily Living Scale for the institutionalized elderly persons

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The validation of the Hong Kong Chinese version of the Lawton Instrumental Activities of Daily Living Scale for the institutionalized elderly persons

 

Author: Tong, Yuk-chung Angela
Title: The validation of the Hong Kong Chinese version of the Lawton Instrumental Activities of Daily Living Scale for the institutionalized elderly persons
Degree: M.Sc.
Year: 1999
Subject: Older people -- Health and hygiene -- China -- Hong Kong
Older people -- Institutional care -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: xi, 147 leaves : ill. ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1483490
URI: http://theses.lib.polyu.edu.hk/handle/200/401
Abstract: The Lawton Instrumental Activities of Daily Living (IADL) scale is the most commonly used IADL assessment tool in Hong Kong. However there is no published validation study for the Lawton IADL scale in Hong Kong population. This study is thus to estimate the reliability and establish evidence on the content and construct validity of the Hong Kong Chinese version of the Lawton IADL scale (HK Lawton IADL scale) in elderly persons. This study was divided into four parts: translation, content validity, reliability and construct validity. 146 institutionalized elderly persons from three hostels (n = 111) and one care-and-attention home (n = 35) were included by convenience sampling method and by staff selection respectively. The Hong Kong Chinese version was first translated by the translator and researcher. Amendments were made after panel review, pilot study on elderly persons, and backward translation. In the study of content validity, the content of the scale, the scoring criteria, translation and level of rating scale were examined. Eight experienced Occupational therapists and academics were invited to be the panel members. Mailed questionnaires and follow-up telephone interview were given. The results showed that eight out of nine items were culturally relevant (> 78% of agreement). Nine items altogether had representativeness in assessing the Hong Kong elderly IADL ability (73% of agreement). Relating to the scoring criteria, six out of nine items were considered cultural relevant while four items were viewed having satisfactory representativeness (>70% of agreement). Concerning the level of scale, most panel members supported to change the level of rating scale from 3-point scale to be 4-point scale. Moreover, psychometric properties of the 3-point and 4-point of scale were also compared and the results of both levels of rating scale were comparable to each other satisfactorily. In estimation of reliability, the inter-rater reliability was established by having five trained raters to assess nine videotaped subjects at the same time. The test-retest reliability was estimated by assessing twenty-nine hostel subjects twice in one-week time by the same rater. The internal consistency was examined by administering the HK Lawton IADL scale to 111 hostel subjects. Results showed that intraclass correlation coefficient (ICC) of the inter-rater reliability was 0.99. In test-retest reliability, ICC was 0.9 and Pearson's correlation coefficient was 0.91. The Cronbach's alpha of the internal consistency was 0.86. In studying the construct validity, factor analysis and known-groups method were used. The factor analysis was examined by administering the HK Lawton IADL scale to 111 hostel subjects. The known-groups method was performed by using the HK Lawton IADL scale to discriminate 146 institutionalized subjects into their corresponding living institutions: hostel and care-and-attention home. In the findings of construct validity, one factor was extracted from the nine items of the HK Lawton IADL scale with factor analysis, and overall 78% of prediction was achieved to correctly discriminate the hostel and care-and-attention home subjects into their corresponding living institutions. As a conclusion, the HK Lawton IADL scale is a valid and reliable instrument to assess elderly IADL ability of independent community living.

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