Expert insight:

Do you know the answer to this exercise on QALYs?

By Prof. Dr. Lieven Annemans, expert-trainer of the Health Economics for Non-Health-Economists course and The Health Technology Assessment Course.

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The QALY (= Quality Adjusted Life Year) is a commonly used measure in health economic evaluations that should be well understood across functions in pharma … but we notice in our courses that many executives actually do not fully grasp it (unless they followed Lieven's course).

The QALY combines quality of life (measured by a utility level between 0 and 1) and quantity of life (measured in years) into a single measure.  It is used to measure improvements in health for any pharmaceutical or other health technology and can be used to compare the value delivered by, say, a new asthma drug with the value from, say, a new cancer drug. All executives in functions dealing with external stakeholders should master it because payers use it to allocate healthcare resources within tight healthcare budgets.

To test yourself, answer the following exercise:

exercise_qaly.png


The Answer:

The QALY can be calculated using the following formula which assumes a utility value (quality of life) between 1 = perfect health and 0 = death:


Years of Life x Utility Value = #QALYs
 

In the exercise, the gain in QALYs with medicine B over medicine A is calculated from the difference between the two surfaces in the graph:

  • QALYs with medicine A = 5 x 0.5 = 2.5 QALYs
  • QALYs with medicine B = (6 x 0.7) - (3 x 0.1) = 3.9 QALYs
  • The difference is 1.4 QALYs

Last update: November 2017

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