Stage 4: Testing the psychometric performance of candidate items
Stage 4 involved a large survey with patients (acute, long-term conditions, and mental health service users), social care users, carers and the general public to test the psychometric performance of items that were retained in Stage 3 and their response options.
This was undertaken in the United Kingdom (UK) as well as in five other countries (Argentina, Australia, China, Germany, USA) by international collaborators.
The findings from this stage were used alongside the Stage 3 results to summarise the evidence on the performance of the items.
The aim was to use this information to support the selection of questions for a longer questionnaire and a shorter health classification system. The latter would be taken forward to the next stage for valuation.
Methods and reports
Aim: To assess the performance of items retained in Stage 3 in terms of content validity, known group validity as well as dimensions and performance of items
Methods: Survey with patients, carers, social care users and members of the general public (see summary documents below) [Translations (PDF, 464KB)]
Paper: Peasgood, T., Mukuria, C., Brazier, J., Marten, O., Kreimeier, S., Luo, N., Mulhern, B., Greiner, W., Pickard, A.S., Augustovski, F. and Engel, L., (2022). Developing a New Generic Health and Wellbeing Measure: Psychometric Survey Results for the EQ Health and Wellbeing. Value in Health.
Country specific findings:
United Kingdom (Classical (PDF, 881KB) and IRT (PDF, 1.74MB))
Unites States of America (Classical (PDF, 814KB) and IRT (PDF, 1.9MB))