The development of ICECAP-A was an MRC-funded project that aimed to develop a broader benefit measure for use in economic evaluation. The project was funded between 2008 and 2011, to develop, value and validate a measure of adult capability. The descriptive system for the measure is now available and the index values (tariffs) have been finalised and are awaiting publication.
The project team is: Joanna Coast (chief investigator), Hareth Al-Janabi (research fellow), Terry Flynn, Sam Clemens, Tim Peters, John Brazier, Stirling Bryan (all co-investigators), Tom Keeley (PhD student)
Phase 1 - development of conceptual attributes: The first phase used in-depth interviews with informants from across the general adult population to define conceptual attributes of quality of life for this population. Analysis used constant comparative techniques on an iterative basis.
Phase 2 - development of ICECAP-A descriptive system: The second phase used repeat semi-structured interviews with informants included in phase 1 to develop meaningful terminology for the adult population. Analysis again used constant comparative techniques on an iterative basis.
Phase 3 - valuation of ICECAP-A: The third phase used interviewer administered best-worst scaling discrete choice experiments with 400 respondents from a general adult population sample to obtain index values for the ICECAP-A attributes. Multinomial logistic regression was used to analyse the choice data and generate index values for the ICECAP-A measure.
Phase 4 - validity and reliability of ICECAP-A: The final phase is on-going. The aim of this phase is to explore the validity and reliability of the measure. Much of this work will be alongside trials and other studies. In work already completed, the construct validity of the measure in the general population has been assessed, and a ‘think aloud’ study has been conducted - here respondents were asked to think aloud as they complete the questionnaire and then to reflect on the task. The interviews were tape recorded and analysed thematically; responses were also rated independently for response problems.
Before using ICECAP-A in your study please register with us first. You do not have to pay to use the measure, but please complete the registration form.
Once you have completed the form please email a copy to Philip Kinghorn
You can download the ICECAP-A questionnaire by clicking on this link. Please note that following piloting of the questionnaire in February 2010, the wording was slightly altered. Please use this updated version (denoted by V2 in the footer) in any studies.
Please remember to register with us before you start, by using the Registration form
A Welsh translation of ICECAP-A has been developed by Heledd Owen and colleagues in the School of Healthcare Sciences at Bangor University. You can obtain the Welsh translation of the questionnaire by clicking here. Once again, please ensure that you register with us before using any versions of the questionnaire.
If you have any questions about using ICECAP-A in your study or would like a word version of the questionnaire please contact Joanna Coast or Philip Kinghorn
Please click here to download the STATA code to score the ICECAP-A instrument
The development of the ICECAP-A measure is detailed in:
Al-Janabi H, Flynn T, Coast J. Development of a self-report measure of capability wellbeing for adults: the ICECAP-A. Quality of Life Research (in press).
Al-Janabi H, Peters TJ, Brazier J, Bryan S, Flynn TN, Clemens S, Moody A, Coast J. An investigation of the construct validity of the ICECAP-A capability measure. Quality of Life Research. Online first: doi: 10.1007/s11136-012-0293-5
Al-Janabi H, Keeley T, Mitchell P, Coast J. Can capabilities be self-reported? A think-aloud study. Social Science and Medicine. 2013; 87: 116-122
Keeley T, Al-Janabi H, Lorgelly P & Coast J. A Qualitative Assessment of the Content Validity of the ICECAP-A and EQ-5D-5L and Their Appropriateness for Use in Health Research. PLoS ONE 8(12)
UK index values for the ICECAP-A are presented in:
Flynn TN, Huynh E, Peters TJ, Al-Janabi H, Moody A, Clemens S, Coast J. Scoring the ICECAP-A capability instrument. Estimation of a UK general population tariff. Health Economics. Online first: doi: 10.1002/hec.3014