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Validation of a computer-adaptive test to evaluate generic health-related quality of life

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dc.contributor.author Rebollo, Pablo
dc.contributor.author Castejón, Ignacio
dc.contributor.author Cuervo, Jesús
dc.contributor.author Villa, Guillermo
dc.contributor.author García-Cueto, Eduardo
dc.contributor.author Díaz-Cuervo, Helena
dc.contributor.author Zardain, Pilar C.
dc.contributor.author Muñiz, José
dc.contributor.author Alonso Caballero, Jordi
dc.contributor.author Spanish CAT-Health Research Group
dc.date.accessioned 2015-06-09T08:11:12Z
dc.date.available 2015-06-09T08:11:12Z
dc.date.issued 2010
dc.identifier.citation Rebollo P, Castejón I, Cuervo J, Villa G, García-Cueto E, Díaz-Cuervo H et al. Validation of a computer-adaptive test to evaluate generic health-related quality of life. Health Qual Life Outcomes. 2010;8:147. DOI: 10.1186/1477-7525-8-147
dc.identifier.issn 1477-7525
dc.identifier.uri http://hdl.handle.net/10230/23776
dc.description.abstract Background: Health Related Quality of Life (HRQoL) is a relevant variable in the evaluation of health outcomes. Questionnaires based on Classical Test Theory typically require a large number of items to evaluate HRQoL. Computer Adaptive Testing (CAT) can be used to reduce tests length while maintaining and, in some cases, improving accuracy. This study aimed at validating a CAT based on Item Response Theory (IRT) for evaluation of generic HRQoL: the CAT-Health instrument. Methods: Cross-sectional study of subjects aged over 18 attending Primary Care Centres for any reason. CAT-Health was administered along with the SF-12 Health Survey. Age, gender and a checklist of chronic conditions were also collected. CAT-Health was evaluated considering: 1) feasibility: completion time and test length; 2) content range coverage, Item Exposure Rate (IER) and test precision; and 3) construct validity: differences in the CAT-Health scores according to clinical variables and correlations between both questionnaires. Results: 396 subjects answered CAT-Health and SF-12, 67.2% females, mean age (SD) 48.6 (17.7) years. 36.9% did not report any chronic condition. Median completion time for CAT-Health was 81 seconds (IQ range = 59-118) and it increased with age (p < 0.001). The median number of items administered was 8 (IQ range = 6-10). Neither ceiling nor floor effects were found for the score. None of the items in the pool had an IER of 100% and it was over 5% for 27.1% of the items. Test Information Function (TIF) peaked between levels -1 and 0 of HRQoL. Statistically significant differences were observed in the CAT-Health scores according to the number and type of conditions. Conclusions: Although domain-specific CATs exist for various areas of HRQoL, CAT-Health is one of the first IRT-based CATs designed to evaluate generic HRQoL and it has proven feasible, valid and efficient, when administered to a broad sample of individuals attending primary care settings.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher BioMed Central
dc.relation.ispartof Health and quality of life outcomes. 2010;8:147
dc.rights © 2010 Rebollo et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.uri http://creativecommons.org/licenses/by/2.0
dc.subject.other Qualitat de vida
dc.subject.other Centres d'atenció primària
dc.title Validation of a computer-adaptive test to evaluate generic health-related quality of life
dc.type info:eu-repo/semantics/article
dc.identifier.doi http://dx.doi.org/10.1186/1477-7525-8-147
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.type.version info:eu-repo/semantics/publishedVersion


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