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Valuing the SF-6Dv2 in the capital of Iran using a discrete choice experiment with duration

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Abstract

Background

The second version of the Short-Form 6-Dimension (SF-6Dv2) classification system has recently been developed. The objective of this study was to develop a value set for SF-6Dv2 based on the societal preferences of a general population in the capital of Iran.

Methods

A representative sample of the capital of Iran (n = 3061) was recruited using a stratified multistage quota sampling technique. Face-to-face interviews were conducted using binary choice sets from the international valuation protocol of the discrete choice experiment with duration. The conditional logit was used to estimate the final value set, and a latent class model was employed to assess heterogeneity of preferences.

Results

Coefficients generated from the models were logically consistent and significant. The best model was the one that included an additional interaction term for cases where one or more dimensions reached their most severe levels. It provides a value set with logical consistent coefficients and the lowest percentage of worse than death health states. Predicted values for the SF-6Dv2 were within the range of − 0.796–1. Pain dimension had the largest impact on utility decrement, whereas vitality had the least impact. The presence of preference heterogeneity was evident, and the Bayesian Information Criterion indicated the optimal fit for a latent class model with two classes.

Conclusion

This study provided the SF-6Dv2 value set for application in the context of Iran. This value set will facilitate the use of the SF-6Dv2 instrument in health economic evaluations and clinical settings.

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Data availability

Available on a reasonable request from the corresponding author.

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Acknowledgements

Authors acknowledge the input of the SF- 6Dv2 international project team. They also thank all respondents for taking part in the study.

Funding

This study was funded by the Tehran University of Medical Sciences.

Author information

Authors and Affiliations

  1. Department of Health Management, Policy, and Economics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

    Rajabali Daroudi & Ali Akbari Sari

  2. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

    Hojjat Zeraati

  3. Department of Management, Evaluation and Health Policy, School of Public Health, University of Montreal, Montreal, QC, Canada

    Thomas G. Poder & Hosein Ameri

  4. Centre de Recherche de L’Institut Universitaire en Santé Mentale de Montréal, CIUSSS de L’Est de L’île de Montréal, Montreal, QC, Canada

    Thomas G. Poder & Hosein Ameri

  5. Curtin University, Perth, Australia

    Richard Norman

  6. Health Equity Research Centre (HERC), Tehran University of Medical Sciences, Tehran, Iran

    Alireza Olyaeemanesh

  7. Department of Health Management and Economics, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

    Hosein Ameri

Authors
  1. Rajabali Daroudi
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  6. Ali Akbari Sari
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Contributions

Concept and design were done by RD, A A-S, HZ, A R-O, and RN. Acquisition of data was done by RD, A A-S, and A R-O. Analysis and interpretation of data were done by RD, HA, HZ, and T.G.P. Writing and revising the manuscript were done by HA, T.G.P, RD, and RN. Statistical analysis was done by RD and HA. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Ali Akbari Sari or Hosein Ameri.

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Conflict of interest

Authors declare that they have no conflict of interest.

Ethical approval

All procedures involving human participants were in accordance with the ethical standards of the national research committee approval no. IR.TUMS.REC.1394.743.

Informed consent

Informed written consent was obtained from all participants included in the study.

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Daroudi, R., Zeraati, H., Poder, T.G. et al. Valuing the SF-6Dv2 in the capital of Iran using a discrete choice experiment with duration. Qual Life Res (2024). https://doi.org/10.1007/s11136-024-03649-5

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  • DOI: https://doi.org/10.1007/s11136-024-03649-5

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