Construct validity of the Chinese version of the activities of daily living rating scale III in patients with schizophrenia
Journal
PLoS ONE
Journal Volume
10
Journal Issue
6
Pages
e0130702
Date Issued
2015
Author(s)
Abstract
Background: The Chinese version of the Activities of Daily Living Rating Scale III (ADLRS-III), which has 10 domains, is commonly used for assessing activities of daily living (ADL) in patients with schizophrenia. However, construct validity (i.e., unidimensionality) for each domain of the ADLRS-III is unknown, limiting the explanations of the test results. Purpose: This main purpose of this study was to examine unidimensionality of each domain in the ADLRS-III. We also examined internal consistency and ceiling/floor effects in patients with schizophrenia. Methods: From occupational therapy records, we obtained 304 self-report data of the ADLRS-III. Confirmatory factor analysis (CFA) was conducted to examine the 10 one-factor structures. If a domain showed an insufficient model fit, exploratory factor analysis (EFA) was performed to investigate the factor structure and choose one factor representing the original construct. Internal consistency was examined using Cronbach's alpha (α). Ceiling and floor effects were determined by the percentage of patients with the maximum and minimum scores in each domain, respectively. Results: CFA analyses showed that 4 domains (i.e., leisure, picture recognition, literacy ability, communication tools use) had sufficient model fits. These 4 domains had acceptable internal consistency (α = 0.79-0.87) and no ceiling/floor effects, except the leisure domain which had a ceiling effect. The other 6 domains showed insufficient model fits. The EFA results showed that these 6 domains were two-factor structures. Conclusion: The results supported unidimensional constructs of the leisure, picture recognition, literacy ability, and communication tool uses domains. The sum scores of these 4 domains can be used to represent their respective domain-specific functions. Regarding the 6 domains with insufficient model fits, we have explained the two factors of each domain and chosen one factor to represent its original construct. Future users may use the items from the chosen factors to assess domain-specific functions in patients with schizophrenia. ? 2015 Chiu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Other Subjects
Activities of Daily Living Rating Scale III; adult; Article; Chinese; communication aid; confirmatory factor analysis; construct validity; daily life activity; disease classification; exploratory factor analysis; factorial analysis; female; financial management; human; independence; internal consistency; leisure; major clinical study; male; medical record; occupational therapy; personal hygiene; problem solving; psychometry; rating scale; reading; recognition; reliability; schizophrenia; self report; traffic and transport; validation process; China; factor analysis; pathophysiology; psychometry; questionnaire; reproducibility; schizophrenia; Activities of Daily Living; Adult; China; Factor Analysis, Statistical; Female; Humans; Male; Psychometrics; Reproducibility of Results; Schizophrenia; Surveys and Questionnaires
Publisher
Public Library of Science
Type
journal article