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Answers
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Intervention 3 is the most cost-effective.
Why? It offers (£1,000 / 0.5 = £2,000) per QALY.
Intervention 2 is the second most effective intervention.
Why? Although both 2 and 1 have a cost per QALY of £10,000, the benefits of Intervention 1 will be subject to discounting.
Intervention 1 is the least cost-effective.
Why? This is because the 20 QALYs gained will be discounted over a long period.