Disability Measurement for Korean Community-Dwelling Adults With Stroke: Item-Level Psychometric Analysis of the Korean Longitudinal Study of Ageing
Annals of Rehabilitation Medicine
;
: 336-345, 2018.
Article
in English
| WPRIM
| ID: wpr-714266
ABSTRACT
OBJECTIVE:
To investigate the psychometric properties of the activities of daily living (ADL) instrument used in the analysis of Korean Longitudinal Study of Ageing (KLoSA) dataset.METHODS:
A retrospective study was carried out involving 2006 KLoSA records of community-dwelling adults diagnosed with stroke. The ADL instrument used for the analysis of KLoSA included 17 items, which were analyzed using Rasch modeling to develop a robust outcome measure. The unidimensionality of the ADL instrument was examined based on confirmatory factor analysis with a one-factor model. Item-level psychometric analysis of the ADL instrument included fit statistics, internal consistency, precision, and the item difficulty hierarchy.RESULTS:
The study sample included a total of 201 community-dwelling adults (1.5% of the Korean population with an age over 45 years; mean age=70.0 years, SD=9.7) having a history of stroke. The ADL instrument demonstrated unidimensional construct. Two misfit items, money management (mean square [MnSq]=1.56, standardized Z-statistics [ZSTD]=2.3) and phone use (MnSq=1.78, ZSTD=2.3) were removed from the analysis. The remaining 15 items demonstrated good item fit, high internal consistency (person reliability=0.91), and good precision (person strata=3.48). The instrument precisely estimated person measures within a wide range of theta (−4.75 logits <θ< 3.97 logits) and a reliability of 0.9, with a conceptual hierarchy of item difficulty.CONCLUSION:
The findings indicate that the 15 ADL items met Rasch expectations of unidimensionality and demonstrated good psychometric properties. It is proposed that the validated ADL instrument can be used as a primary outcome measure for assessing longitudinal disability trajectories in the Korean adult population and can be employed for comparative analysis of international disability across national aging studies.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Psychometrics
/
Activities of Daily Living
/
Aging
/
Surveys and Questionnaires
/
Reproducibility of Results
/
Retrospective Studies
/
Longitudinal Studies
/
Outcome Assessment, Health Care
/
Stroke
/
Dataset
Type of study:
Observational study
/
Prognostic study
Limits:
Adult
/
Humans
Language:
English
Journal:
Annals of Rehabilitation Medicine
Year:
2018
Type:
Article
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