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Revealed and Stated Preferences of Decision Makers for Priority Setting in Health Technology Assessment: A Systematic Review

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Abstract

Background

There is much interest from stakeholders in understanding how health technology assessment (HTA) committees make national funding decisions for health technologies. A growing literature has analysed past decisions by committees (revealed preference, RP studies) and hypothetical decisions by committee members (stated preference, SP studies) to identify factors influencing decisions and assess their importance.

Objectives

A systematic review of the literature was undertaken to provide insight into committee preferences for these factors (after controlling for other factors) and the methods used to elicit them.

Methods

Ovid Medline, Embase, Econlit and Web of Science were searched from inception to 11 May 2017. Included studies had to have investigated factors considered by HTA committees and to have conducted multivariate analysis to identify the effect of each factor on funding decisions. Factors were classified as being important based on statistical significance, and their impact on decisions was compared using marginal effects.

Results

Twenty-three RP and four SP studies (containing 42 analyses) of 14 HTA committees met the inclusion criteria. Although factors were defined differently, the SP literature generally found clinical efficacy, cost-effectiveness and equity factors (such as disease severity) were each important to the Pharmaceutical Benefits Advisory Committee (PBAC), the National Institute for Health and Care Excellence (NICE) and the All Wales Medicines Strategy Group. These findings were supported by the RP studies of the PBAC, but not the other committees, which found funding decisions by these and other committees were mostly influenced by the acceptance of the clinical evidence and, where applicable, cost-effectiveness. Trust in the evidence was very important for decision makers, equivalent to reducing the incremental cost-effectiveness ratio (cost per quality-adjusted life-year) by A$38,000 (Australian dollars) for the PBAC and £15,000 for NICE.

Conclusions

This review found trust in the clinical evidence and, where applicable, cost-effectiveness were important for decision makers. Many methodological differences likely contributed to the diversity in some of the other findings across studies of the same committee. Further work is needed to better understand how competing factors are valued by different HTA committees.

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Notes

  1. Univariate analyses were excluded because they do not account for confounding effects of other factors which may lead to biased results. For example, given cancer drugs are generally more expensive than non-cancer drugs and more expensive drugs are less likely to be funded than less expensive drugs, a univariate analysis may find that cancer drugs are less likely to be funded than non-cancer drugs. However, this may not be the case if the analysis also controls for drug costs.

  2. For example, in a logistic model without interaction terms, the change in probability of a positive recommendation from a reference point \(\Delta P_{j} = \frac{1}{{1 + e^{{ - \left( {L + \beta_{j} } \right)}} }} - P_{\text{ref}} ,\quad {\text{where}}\quad L = \ln \left( {\frac{{P_{\text{ref}} }}{{1 - P_{\text{ref}} }}} \right).\)

  3. A number of these used ICERs sourced from the literature rather than ICERs considered by the committees. However, none of these studies did so due to confidentiality issues. These studies were exploratory in nature and did not investigate the impact of evidence considered on funding decisions. In one study [18], the committee under consideration does not assess cost-effectiveness and hence no ‘official’ ICER existed. In the other studies [17, 19], ‘current funding status’ of health technologies was investigated. However, ‘current funding status’ is not equivalent to a past funding decision, given technologies which are not currently funded may never have been considered by a committee. None of the data used in those studies were sourced from committee documents.

  4. Variables were commonly defined on the basis of an interpretation of the source data by researchers rather than an explicit classification by the committee. Such variables were considered to be defined in an ex-post fashion, or after the fact, and may not have been directly considered by the committee.

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Acknowledgements

The author team would like to thank Dennis Petrie for his helpful suggestions and valuable advice in drafting the review.

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Authors and Affiliations

Authors

Contributions

All authors designed the systematic review. PG and YG applied the selection criteria to the identified studies; EL adjudicated any differences. PG and SZ extracted and synthesised the data. PG drafted the manuscript, with input from the other authors. PG acts as guarantor for the paper and accepts full responsibility for the conduct of the review and decision to publish.

Corresponding author

Correspondence to Peter Ghijben.

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Funding

The research was supported by a National Health and Medical Research Council (NHMRC) Project Grant (APP1047788): “Societal and decision maker preferences for priority setting in health care resource allocation”.

Conflict of interest

EL declares no conflict of interest. PG, YG and SZ declare they are contracted through their respective universities to evaluate submissions for listing of pharmaceuticals on the Pharmaceutical Benefits Scheme in Australia. Neither they nor their spouses, partners or children have any other financial or non-financial relationships that may be relevant to the submitted work. The content of this paper does not reflect the views of the Australian Government Department of Health, the Pharmaceutical Benefits Advisory Committee or its sub-committees.

Data Availability Statement

Data sharing is not applicable as no datasets were generated or analysed. All findings were based on the published studies included in this review.

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Ghijben, P., Gu, Y., Lancsar, E. et al. Revealed and Stated Preferences of Decision Makers for Priority Setting in Health Technology Assessment: A Systematic Review. PharmacoEconomics 36, 323–340 (2018). https://doi.org/10.1007/s40273-017-0586-1

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