Psychometric properties of the EQ-5D-3L in South Australia: a multi-method non-preference-based validation study

This study aims to psychometrically validate the EQ-5D-3L in a large population sample in Australia for the first time.METHODS: The EQ-5D-3L was included in the Dental Care and Oral Health study (DCOHS), conducted in a South Australian population sample. The participants were 23-91 years old, and 44.1% were male. The EQ-5D-3L was responded to on a three-point rating scale ("none"/"no", "some" and "extremely"/"unable"/"confined"). We employed the area under the receiver operating characteristic curve (AUROC) to evaluate whether the EQ-5D-3L total score could identify participants with diagnosed diseases and mental health disorders. Psychometric validation of the EQ-5D-3L investigated dimensionality with Exploratory Graph Analysis, model fit, floor/ceiling effects and criterion validity.RESULTS: The EQ-5D-3L comprised two dimensions, Activities and Symptoms. According to Root Mean Squared Error of Approximation (RMSEA) (<.05) and Comparative Fit Index (CFI) (>.950), the 2-dimensional structure showed excellent model fit with good reliability for the Activities subscale (Ωc = 0.80 - 95% CI [0.77, 0.83]), and poor reliability for the Symptom subscale (Ωc =0.56 - 95% CI [0.53, 0.58]). The EQ-5D-3L showed adequate reliability (Ωc= 0.70 - 95% CI [0.67, 0.72]). The EQ-5D-3L showed good discrimination for diagnosed diseases (ranging from 64.3% to 86.3%). Floor/ceiling effects were observed across all items. The EQ-5D-3L total score discriminated between respondents who were e...
Source: Current Medical Research and Opinion - Category: Research Authors: Source Type: research