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Calculating QALYs, comparing QALY and DALY calculations.

Franco Sassi1

  • 1Department of Social Policy, The London School of Economics and Political Science, London, UK. f.sassi@lse.ac.uk

Health Policy and Planning
|August 1, 2006
PubMed
Summary

Quality-adjusted life years (QALYs) and disability-adjusted life years (DALYs) are key metrics for health interventions. This paper clarifies their calculation, differences, and implications for research and policy.

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Area of Science:

  • Health Economics
  • Public Health
  • Biostatistics

Background:

  • Quality-adjusted life years (QALYs) have been widely used for health intervention assessment for 30 years.
  • Disability-adjusted life years (DALYs) emerged later within a similar framework, presenting distinct characteristics.
  • Ongoing debate surrounds the theoretical and practical aspects of both QALYs and DALYs.

Purpose of the Study:

  • To provide a comprehensive formulation of QALY calculation methods.
  • To offer practical tools for assessing health intervention impact, analogous to DALY calculation methods.
  • To elucidate systematic differences between QALYs and DALYs.

Main Methods:

  • Formulation of QALY calculation methods.
  • Comparative analysis of QALYs and DALYs using tuberculosis prevention and bipolar depression treatment examples.
  • Graphical illustration of factor importance in metric differences.

Main Results:

  • Differences between QALYs gained and DALYs saved depend on disease characteristics (onset age, duration) and quality of life/disability weights for non-fatal conditions.
  • For fatal diseases, a broader range of factors influences the divergence between QALY and DALY outcomes.
  • The paper graphically illustrates the relative importance of these factors.

Conclusions:

  • Understanding the similarities and differences between QALYs and DALYs is crucial for researchers and policymakers.
  • Accurate interpretation of health intervention outcomes relies on a clear grasp of these two metrics.
  • The study provides practical instruments and insights for evaluating health interventions.

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