Med Decis Making - The use of rasch analysis in reducing a large condition-specific instrument for preference valuation: the case of moving from AQLQ to AQL-5D.

Tópicos

{ assess(1506) score(1403) qualiti(1306) }
{ inform(2794) health(2639) internet(1427) }
{ model(2341) predict(2261) use(1141) }
{ state(1844) use(1261) util(961) }
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{ data(2317) use(1299) case(1017) }
{ age(1611) year(1155) adult(843) }
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Resumo

The majority of health-related quality-of-life instruments are not preference-based measures and so cannot be used within cost utility analysis. The Asthma Quality of Life Questionnaire (AQLQ) is one such instrument. The aim of this study was to develop a health state classification that was amenable to valuation from the AQLQ, this being the 1st stage in developing a condition-specific preference-based measure for asthma patients. Rasch models were applied to samples of responders to the AQLQ with the aim of selecting a number of items for a preference-based utility measure (AQL-5D). Selection of items for the evaluation survey was supported with classical psychometric criteria for item selection (feasibility, internal consistency, floor and ceiling effects, and responsiveness). Rasch analysis proved to be a useful tool in assisting in the initial process of selecting items from an existing health-related quality-of-life instrument in the construction of the AQL-5D. The method is recommended for use alongside classical psychometric testing to aid in the development of preference-based measures.

Resumo Limpo

major healthrel qualityoflif instrument preferencebas measur use within cost util analysi asthma qualiti life questionnair aqlq one instrument aim studi develop health state classif amen valuat aqlq st stage develop conditionspecif preferencebas measur asthma patient rasch model appli sampl respond aqlq aim select number item preferencebas util measur aqld select item evalu survey support classic psychometr criteria item select feasibl intern consist floor ceil effect respons rasch analysi prove use tool assist initi process select item exist healthrel qualityoflif instrument construct aqld method recommend use alongsid classic psychometr test aid develop preferencebas measur

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