EQ-5D is a popular health related quality of life instrument used
in the clinical and economic evaluation of health care. Developed by the
EuroQol group < https://www.euroqol.org>, the instrument consists of two
components: health state description and evaluation. For the description
component a subject self-rates their health in terms of five dimensions;
mobility, self-care, usual activities, pain/discomfort, and
anxiety/depression using either a three-level (EQ-5D-3L,
< https://www.euroqol.org/eq-5d-instruments/eq-5d-3l-about>) or a five-level
(EQ-5D-5L, < https://www.euroqol.org/eq-5d-instruments/eq-5d-5l-about>)
scale. Frequently the scores on these five dimensions are converted to a
single utility index using country specific value sets, which can be used
in the clinical and economic evaluation of health care as well as in
population health surveys. The eq5d package provides methods to calculate
index scores from a subject's dimension scores. 25 TTO and 11 VAS EQ-5D-3L value
sets including those for countries in Szende et al (2007)