What Determines the Shape of an EQ-5D Index Distribution?
David Parkin, Nancy Devlin, Yan Feng
Medical Decision Making | Published : 2016
BACKGROUND: EQ-5D-3L index scores in patient and general populations typically have a nonnormal distribution, divided into 2 distinct groups. It is important to understand to what extent this is determined by the way that the EQ-5D-3L index is constructed rather than by the true distribution of ill health. OBJECTIVE: This paper examines the determinants of the "2 groups" distribution pattern and the extent to which this pattern is attributable either to the EQ-5D-3L classification system used to create health state profiles or to the weights applied to profiles. METHODS: Data from the English NHS PROMs program (hip and knee replacements and varicose vein and hernia repairs) and from a study ..View full abstract