Article

Quality of Life Research

, Volume 22, Issue 7, pp 1831-1840

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

An investigation of the construct validity of the ICECAP-A capability measure

  • Hareth Al-JanabiAffiliated withHealth Economics Unit, School of Health and Population Sciences, Public Health Building, University of Birmingham Email author 
  • , Tim J. PetersAffiliated withSchool of Clinical Sciences, University of Bristol
  • , John BrazierAffiliated withSchool of Health and Related Research, University of Sheffield
  • , Stirling BryanAffiliated withSchool of Population and Public Health, University of British Columbia
  • , Terry N. FlynnAffiliated withCentre for the Study of Choice, University of Technology Sydney
  • , Sam ClemensAffiliated withNational Centre for Social Research
  • , Alison MoodyAffiliated withInstitute of Epidemiology and Health Care, University College London
  • , Joanna CoastAffiliated withHealth Economics Unit, School of Health and Population Sciences, Public Health Building, University of Birmingham

Abstract

Purpose

To investigate the construct validity of the ICECAP-A capability wellbeing measure.

Methods

A face-to-face interview-administered survey was conducted with 418 members of the UK general population, randomly sampled from the Postcode Address File. Pre-specified hypotheses were developed about the expected associations between individuals’ ICECAP-A responses and their socio-economic circumstances, health and freedom. The hypotheses were investigated using statistical tests of association.

Results

The ICECAP-A responses and scores reflected differences across different health and socioeconomic groups as anticipated, but did not distinguish individuals by the level of local deprivation. Mean ICECAP-A scores reflected individuals’ perceived freedom slightly more closely than did measures of health and happiness.

Conclusion

This study suggests that the ICECAP-A measure can identify expected differences in capability wellbeing in a general population sample. Further work could establish whether self-reported capabilities exhibit desirable validity and acceptability in sub-groups of the population such as patients, social care recipients and informal carers.

Keywords

Capability approach Health economics Outcomes Psychometrics Quality of life Wellbeing