The ICECAP-A instrument for capabilities: assessment of construct validity and test-retest reliability in a general Dutch population

P.J. Rohrbach, A.E. Dingemans, B.A. Essers, E.F. Van Furth, P. Spinhoven, C.G.M. Groothuis-Oudshoorn, J.A. Van Til, M.E. Van den Akker-Van Marle*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Web of Science)


Purpose The ICEpop CAPability measure for Adults (ICECAP-A) assesses five capabilities that are important to one's well-being. The instrument might be an important addition to generic health questionnaires when evaluating quality of life extending beyond health. This study aimed to conduct a psychometric assessment of the Dutch translation of the ICECAP-A. Methods Construct validity of the instrument was assessed in two ways. First, by measuring correlations with the EQ-5D-5L questionnaire and a measure of self-efficacy and, second, by investigating the ability to distinguish between groups known to differ on the construct the ICECAP-A means to capture. Additionally, test-retest reliability was evaluated. Results In total, 1002 participants representative of the general Dutch population completed an online survey. For test-retest reliability, 252 participants completed the same questionnaire 2 weeks later. The ICECAP-A indicated moderate to strong correlations with the EQ-5D-5L and a strong correlation with self-efficacy. Furthermore, it was capable of differentiating known groups. Moreover, results indicated adequate test-retest reliability with an intraclass correlation coefficient of 0.79. Conclusion In summary, results suggest adequate test-retest reliability and construct validity and indicate that the ICECAP-A might be of added value, especially when considering areas outside of the traditional health intervention model.
Original languageEnglish
Pages (from-to)687-696
Number of pages10
JournalQuality of Life Research
Issue number3
Early online date31 Aug 2021
Publication statusPublished - Mar 2022


  • Capabilities
  • Well-being
  • Psychometric assessment
  • Known-group validity

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