title: An investigation of the construct validity of the ICECAP-A capability measure.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Health Economics Unit, School of Health and Population Sciences, Public Health Building, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. h.aljanabi@bham.ac.uk
authors.forename: Hareth
authors.initials: H
authors.lastname: Al-Janabi
authors.forename: Tim J
authors.initials: TJ
authors.lastname: Peters
authors.forename: John
authors.initials: J
authors.lastname: Brazier
authors.forename: Stirling
authors.initials: S
authors.lastname: Bryan
authors.forename: Terry N
authors.initials: TN
authors.lastname: Flynn
authors.forename: Sam
authors.initials: S
authors.lastname: Clemens
authors.forename: Alison
authors.initials: A
authors.lastname: Moody
authors.forename: Joanna
authors.initials: J
authors.lastname: Coast
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D008875:Middle Aged; D010465:Perception; D010549:Personal Satisfaction; D011594:Psychometrics; D011788:Quality of Life / Q000523:psychology*; D012044:Regression Analysis; D015203:Reproducibility of Results; D057566:Self Report; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires / Q000592:standards*; D055815:Young Adult