A unit of health care outcome that combines gains (or losses) in LENGTH OF LIFE w/ QUALITY OF LIFE. represent years of life subsequent to a health care intervention that are weighted or adjusted for the quality of life experienced by the patient during those years used primarily to adjust a person’s life expectancy by the levels of health-related quality of life that the person is predicted to experience during the remainder of life or some interval of it. purpose are to comparing the relative impact on personal and population health of specific diseases or conditions, comparing the relative impact on personal and population health of specific technologies