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Test–retest reliability of ICECAP-A in the adult Danish population

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Abstract

Purpose

To investigate the test–retest reliability of Investigating Choice Experiments Capability measure for Adults (ICECAP-A) in the adult Danish population.

Methods

The original English ICECAP-A was translated into Danish by forward–backwards translation using the guidelines by Beaton et al. Three hundred and-thirty-two participants with mean age of 57 years participated in a Web-based study. Data concerning relative and absolute agreement were analysed by the intra-class correlation coefficient and Bland–Altman plot with limits of agreement. The overall and item consistency was investigated by weighted kappa statistics from baseline to 2-week follow-up. Logistic regression was used to study the effect of the sociodemographic characteristics with inconsistent responses as the dependent binary variable. The independent variables were age, sex, education, income, and region of residence at baseline.

Results

The baseline ICECAP-A preference-based index score was 0.84, and at follow-up, 0.83. The ICC was 0.86 (95% CI 0.826–0.884), and limits of agreement were 0.164 and − 0.151. The kappa coefficient ranges from 45 to 65%, between random and perfect agreement. The logistic regression to analyse inconsistent responses showed no significant association between the overall index score and sociodemographic characteristics, and no clear pattern was found concerning the individual item inconsistency.

Conclusions

Evidence regarding the reliability of the Danish version of ICECAP-A is satisfactory for both the index score agreement and the individual item consistency and is a reliable measure to be used in a Danish context and future health economic evaluations.

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Notes

  1. The corresponding author obtained permission to translate and use ICECAP-A into the Danish version by the ICECAP team, University of Birmingham.

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Acknowledgements

We are grateful for the respondents and the staff at EPINION for their time and assistance with the survey. Also, we thank Joanna Coast, Paul M. Mitchell, and Myles-Jay Linton for their helpful comments.

Funding

This study was funded by the municipality of Aalborg, and The Health Foundation (Helse Fonden) (Grant No. 463019).

Author information

Authors and Affiliations

  1. Department of Business and Management, Danish Center for Healthcare Improvements, Aalborg University, Fibigerstraede 11, 9220, Aalborg, Denmark

    Annette Willemoes Holst-Kristensen & Kjeld Møller Pedersen

  2. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

    Kirsten Fonager

  3. Department of Social Medicine, Aalborg University Hospital, Aalborg, Denmark

    Kirsten Fonager

Authors
  1. Annette Willemoes Holst-Kristensen
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  2. Kirsten Fonager
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  3. Kjeld Møller Pedersen
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Corresponding author

Correspondence to Annette Willemoes Holst-Kristensen.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

The study has been carried out in accordance with the General Data Protection Regulation (2015-509-00007). Moreover, The National Committee on Health Research Ethics has assured us that no approval is needed.

Informed consent

Informed consent was obtained from all individual participants included in the study by the professional survey agency EPINION.

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Holst-Kristensen, A.W., Fonager, K. & Pedersen, K.M. Test–retest reliability of ICECAP-A in the adult Danish population. Qual Life Res 29, 547–557 (2020). https://doi.org/10.1007/s11136-019-02331-5

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