The Use of Rasch Analysis in Reducing a Large Condition-Specific Instrument for Preference Valuation: The Case of Moving from AQLQ to AQL-5D

作者：Young Tracey A; Yang Yaling; Brazier John E^*; Tsuchiya Aki

来源：Medical Decision Making, 2011, 31(1): 195-210.

DOI：10.1177/0272989X10364846

• asthma
• pulmonary disease
• health-related quality of life (HRQOL)
• Rasch analysis
• preference-based measures

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.

• 出版日期2011-2