QALYs

Question 1

QALY Meaning

Answer 1

QALY stands for ‘Quality-Adjusted Life Year’.

1 QALY = one year of life in perfect health.

QALYs are used in the assessment of treatments for certain conditions.

Question 2

How are QALYs calculated? The QALY Calculation:

Answer 2

The QALY Formula: QALYs are calculated by multiplying the time spent in a particular health state by the HRQL score.

QALY = time spent in a particular health state x Health-Related Quality-of-Life score

Question 3

What is the HRQL score?

Answer 3

The HRQL score is the Health-Related Quality-of-Life score. It is a subjective score which looks at how a patient views their health and quality of life.

There are a few different ways to calculate the HRQL score, however, you would not be expected to know this for an interview.

The HRQL score incorporates things such as a person’s mobility, pain, anxiety etc.

Question 4

How are QALYs used?

Answer 4

QALYs are used in the assessment of medical treatments by the National Institute for Clinical Excellence (NICE). NICE is the body that provides national guidance on health and social care in the UK.

QALYs can be used alongside the cost of treatment so that NICE can conclude whether a new treatment should be approved for a condition. It will determine the cost per QALY gained for any new treatments to decide whether it is cost-effective to approve it.

Question 5

QALYs and Resource Allocation

Answer 5

allows health economists to prioritize resources, aiming for maximum health benefits per unit of expenditure.

Eg if two treatments cost the same, but one yields more QALYs, resources would be allocated to that treatment.

However, the use of QALYs in resource allocation also raises ethical questions. It implicitly values younger or healthier individuals higher, as they can potentially gain more QALYs from an intervention.

Moreover, treatments for rare diseases often have high costs per QALY, leading to dilemmas in their funding. Despite these concerns, QALYs remain a crucial tool for objective comparisons in healthcare resource allocation.

Question 6

Limitations of QALYs: quality of life and calculations

Answer 6

Quality of Life is hard to quantify. Many patients will value things like mobility differently from others and thus it is difficult to standardise any scales on quality of life.

There are issues with the way QALYs are calculated. In terms of QALYs, 6 months of perfect health is the same as 1 year experiencing a quality of life reduced by 50% (as both calculations would equal 0.5). It is unlikely that many patients would see these two scenarios as equal.

Question 7

Limitations of QALYs: equality and cost effective

Answer 7

QALYs view all people as the same. It does not take into account the characteristics of patient groups. Therefore, QALYs will not help with existing health inequities that affect certain patient groups, as the characteristics of the group would not be identified in the QALY calculation.

A valid “cost-effective” threshold is very difficult to establish, especially as some treatments may have positive effects on patients that cannot be grasped by the QALY calculation.

Question 8

Ethical Considerations of QALYs

Answer 8

Autonomy: The use of QALYs in the assessment of treatment options for conditions does restrict the autonomy of patients, as some treatments can be refused because of their ICER.

Non-maleficence/beneficence: Whilst QALY/ICER calculations can approve drugs for patients and thus improve their quality of life, these measurements also lead to drugs getting restricted that would otherwise positively affect patients.

Justice: It can be argued that patients are not viewed fairly by the QALY measurement, as it assumes that a life of better quality is of more value

Question 9

What is a criticism of QALYs?

Answer 9

Doesn’t Match Reality: Living for a year at half quality isn’t the same as six months at full quality, even though both score as 0.5 QALYs.

Not Fair for Some: Older and disabled people might get lower QALY scores, making their treatments seem less valuable.

Subjective: Quality of life is personal and can vary a lot between people.

Promotes Inequality: People who can gain more QALYs might get more healthcare resources, leaving out others.

Hard to Measure: Figuring out how much quality of life changes due to treatment is a tough task.

Question 10

What is the advantage of using QALYs?

Answer 10

Easy Comparison: QALYs help compare different health treatments, no matter the illness.

Helps with Choices: QALYs help decide which treatments give the most benefit for the cost.

Patient’s View: QALYs consider how patients feel about their own health and treatment.

Question 11

What is the difference between a QALY and a DALY?

Answer 11

QALYs measure how many years are lived with a good quality of life, whereas DALYs (Disability-Adjusted Life Years) measure how many healthy life years have been lost.

A QALY measures the number of years lived in perfect health, taking into account both the quality and the quantity of life lived. The higher the QALY, the better.

In contrast, a DALY is a measure of overall disease burden. The DALY combines years of life lost due to premature mortality and years of life lived with disability. The lower the DALY, the better.

Question 12

Calculating dalys

Answer 12

the sum of the Years of Life Lost (YLL) due to premature mortality in the population and the Years Lost due to Disability (YLD) for people living with the health condition or its consequences.

For YLL, you would multiply the number of deaths at each age by the standard life expectancy at that age.

For YLD, you would multiply the incident cases in that period by the average duration of the case until remission or death (years) and a weight factor that reflects the severity of the disease on a scale from 0 (perfect health) to 1 (dead).