 Although the most commonly used in health resource prioritization, the QALY is not the only health benefit summary measure. The disability-adjusted life year or DALY operates similarly to the QALY, although conversely in terms of the burden of living with a disability, measured in life-years (see Murray 1996). Here 0 is again death and 1 full health and a DALY score measures a health state as a function of life-years lost to disability. To compare the two measures, if the quality-adjusted factor associated with a health state like spinal cord injury (SCI) is 0.4, then the quality of each year of life post-injury is 0.4 of a year lived in full health. If one is expected to live another 30 years, then the overall QALY is 12 years. DALYs work the same way, only in reverse: the person with the SCI would have the overall life burden of 0.6 times 30 years or 18 disability-adjusted life years. (There are other differences between the two measures that are more technical in nature and can be ignored in this discussion.)