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Qual Life Res. 2019 Jun;28(6):1429-1439. doi: 10.1007/s11136-019-02114-y. Epub 2019 Jan 21.

ICECAP-O, the current state of play: a systematic review of studies reporting the psychometric properties and use of the instrument over the decade since its publication.

Author information

1
Health Economics Unit, Institute of Applied Health Research, University of Birmingham, B15 2TT, Edgbaston, UK.
2
Health Economics Unit, Institute of Applied Health Research, University of Birmingham, B15 2TT, Edgbaston, UK. p.kinghorn@bham.ac.uk.

Abstract

PURPOSE:

A paper reporting the development of the ICECAP-O was published in 2006. Since then, there has been increasing interest in the use of capability-based measures within health economics and the ICECAP-O has been suggested for use in economic evaluation by decision-making bodies in the Netherlands and UK.

METHODS:

A systematic review of studies published between January 2006 and October 2018 which have assessed the psychometric properties of ICECAP-O or utilised the measure within economic evaluation.

RESULTS:

Twenty-four studies explored the psychometric properties of ICECAP-O and 21 have utilised the measure within economic evaluation; one study reported psychometric properties as well as utilising the measure within economic evaluation. The ICECAP-O has good construct validity and responsiveness, but there is evidence of some issues relating to content validity. In the context of economic evaluation, the ICECAP-O has, to date, mainly been included as a secondary economic measure and the reporting of results is brief with minimal detail and often no discussion. Five of the economic evaluation studies combined scores from ICECAP-O with time, but each used different terminology to describe this result.

CONCLUSION:

Focus, in terms of publications, appears to have shifted now from assessment of psychometric properties to the utilisation of the ICECAP-O within economic evaluation. Further research is needed with respect to a decision-rule for the ICECAP measures. This additional research should also guide users in terms of appropriate analysis, terminology and presentation of results, which are in-keeping with the conceptual framework underpinning the ICECAP-O.

KEYWORDS:

Capability approach; Economic evaluation; ICECAP-O; Responsiveness; Systematic review; Validity

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