Disability-adjusted life years (DALYs)

A measure of the burden of disease on a defined population and the effectiveness of the intervention. DALYs are advocates as an alternative to QALY and claimed to be a valid indicator of population health.
They are based on adjustment of life expectancy to allow for long term disability as estimated from official statistics. However their use as currently expressed and calculated may be limited because the necessary data are not available or do not exist. Moreover, the concept postulates a continuum from disease to disability to death that is not universally accepted.