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Validation of the "World Health Organization Disability Assessment Schedule, WHODAS-2" in patients with chronic diseases [Elektronski vir]Garin, Olatz ...Background: The WHODAS-2 is a disability assessment instrument based on the conceptual framework of the International Classification of Functioning, Disability, and Health (ICF). It provides a global ... measure of disability and 7 domain-specific scores. The aim of this study was to assess WHODAS-2 conceptual model and metric properties in a set of chronic and prevalent clinical conditions accounting for a wide scope of disability in Europe. Methods: 1,119 patients with one of 13 chronic conditions were recruited in 7 European centres. Participants were clinically evaluated and administered the WHODAS-2 and the SF-36 at baseline, 6 weeks and 3 months of follow-up. The latent structure was explored and confirmed by factor analysis (FA). Reliability was assessed in terms of internal consistency (Cronbach's alpha) and reproducibility (intra-class correlation coefficients, ICC). Construct validity was evaluated by correlating the WHODAS-2 and SF-36 domains, and comparing known groups based on the clinicalseverity and work status. Effect size (ES) coefficient was used to assess responsiveness. To assess reproducibility and responsiveness, subsamples of stable (at 6 weeks) and improved (after 3 moths) patients were defined, respectively, according to changes in their clinical-severity. Results: The satisfactory FA goodness of fit indexes confirmed a second order factor structure with 7 dimensions, and a global score for the WHODAS-2. Cronbach's alpha ranged from 0.77 (self care) to 0.98 (life activities: work or school), and the ICC was lower, but achieved the recommended standard of 0.7 for four domains. Correlations between global WHODAS-2 score and the different domains of the SF-36 ranged from -0.29 to -0.65. Most of the WHODAS-2 scores showed statistically significant differences among clinical-severity groups for all pathologies, and between working patients and those not working due to ill health (p < 0.001). Among the subsample of patients who had improved, responsiveness coefficients were small to moderate (ES = 0.3-0.7), but higher than those of the SF-36. Conclusions: The latent structure originally designed by WHODAS-2 developers has been confirmed for the first time, and it has shown good metric properties in clinic and rehabilitation samples. Therefore, considerable support is provided to the WHODAS-2 utilization as an international instrument to measure disability based on the ICF model.Source: Health and quality of life outcomes [Elektronski vir]. - ISSN 1477-7525 (Vol. 8, 19. maj 2010, 51 (15 str.))Type of material - e-articlePublish date - 2010Language - englishCOBISS.SI-ID - 1052009
Author
Garin, Olatz |
Burger, Helena
Topics
Adult |
Chronic disease |
Disability evaluation |
Female |
Humans |
Longitudinal studies |
Male |
Middle aged |
Quality of life |
Reproducibility of results |
Severity of illness index |
Socioeconomic factors |
odrasli |
kronična bolezen |
ocena invalidnosti |
ženske |
ljudje |
longitudinalne študije |
moški |
odrasli srednjih let |
kvaliteta življenja |
ponovljivost rezultatov |
indeks resnosti bolezni |
socialno ekonomski dejavniki
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Burger, Helena | 14962 |
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