Toward quality assurance in QALY calculations

Area of Science:

• Health Economics
• Biostatistics
• Decision Science

Background:

• Utility weights are crucial for calculating quality-adjusted life-years (QALYs) in health technology assessment.
• Current practices in applying utility weights in scientific literature often lack rigorous theoretical and empirical justification.
• The use of these weights is frequently unquestioned, leading to potential biases in economic evaluations.

Purpose of the Study:

• To critically evaluate the theoretical and empirical basis of utility weights used in published scientific articles.
• To highlight the insufficient sensitivity analyses and lack of transparent reporting regarding utility weight selection.
• To propose a standard for future publications to improve the rigor and reproducibility of QALY assessments.

Main Methods:

• Systematic review of literature on utility weight application in QALY calculations.
• Analysis of the theoretical underpinnings and empirical evidence supporting commonly used utility weights.
• Assessment of reporting practices concerning sensitivity analyses and data transparency.

Main Results:

• A significant weakness in the theoretical and empirical foundation of utility weights was identified across numerous publications.
• Many studies fail to demonstrate the sensitivity of their results to chosen utility weights.
• Inadequate information is provided to readers for independent verification or recalculation.

Conclusions:

• The current application of utility weights in health economics research is often methodologically unsound.
• There is a critical need for greater transparency and justification in the selection and use of utility weights.
• Establishing a standardized reporting guideline is essential to enhance the credibility and utility of QALY-based research.