Abstract
Living longer and healthier boosts individual and family welfare. As part of the World Bank’s Healthy Longevity Initiative, we quantified the economic value of achieving the highest possible life span. We estimated the economic value of reducing avoidable mortality, defined as the difference between observed (or projected) mortality and lowest achieved (or projected) mortality, by world regions, sex, and age, between 2000 and 2021, with projection to 2050. In 2019, 69% of mortality, or 40 million deaths, was avoidable. The economic value of avoidable mortality globally was 23% of annual income, meaning that, globally, populations would be willing to give up about one-fifth of their current income in exchange for a year living at the lowest achieved mortality rate. This value ranges from 19% in China to 34% in sub-Saharan Africa. Under the rapid-progress scenario, in which countries experience fast but plausible mortality reductions from 2019 to 2050, we would expect globally the gap between projected and frontier life expectancy to be halved by 2050, and the economic value after achieving this scenario is equivalent to 14% of annual income. Our work provides supportive evidence on the high economic value placed on improving health.
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Data availability
This study uses publicly available data, including World Population Prospects 2022 (https://population.un.org/wpp/Download/Standard/CSV), the Human Mortality Database (https://www.mortality.org/), World Bank GNI per capita (PPP constant 2017 international dollars) (https://data.worldbank.org/indicator/NY.GNP.PCAP.PP.KD), and the OECD’s projected country-specific growth rates (https://www.oecd.org/economic-outlook.html).
Code availability
Replication code is available on GitHub: https://github.com/achangdias/HLI_evam
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Acknowledgements
A.Y.C., G.A.S., D.S.C., and D.T.J. received funding from The World Bank’s Healthy Longevity Initiative. We thank P. Jha, G. Alleyne, P. Isenman, S. Verguet, S. Bolongaita, and the members of the HLI team who participated in workshops in Mexico City (May 2022) and Washington DC (October 2022) for their feedback. We dedicate this paper to J. W. Vaupel (1945–2022), who inspired us and many others with his intellect, vision, and passion for great research.
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Conceptualization: A.Y.C., G.A.S., D.T.J. Methodology development: A.Y.C., G.A.S., D.S.C., B.C., D.T.J. Analysis: A.Y.C., G.A.S., D.S.C. Original draft preparation: A.Y.C., G.A.S., D.S.C. Reviewing and editing: A.Y.C., G.A.S., D.S.C., B.C., D.T.J.
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Nature Medicine thanks Philip Clarke, Owen O’Donnell and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor Ming Yang, in collaboration with the Nature Medicine team.
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Extended data
Extended Data Fig. 1 Frontier life expectancy, by method.
Alternative projections of the frontier are shown: linear projection of life expectancy (red) and linear projection of the natural log of age-specific frontier mortality (blue, the baseline method used in this study). Estimated/projected life expectancy from WPP2022 for Japanese females is shown for comparison.
Extended Data Fig. 2 Distribution of avoidable mortality, year 2019.
Proportion of deaths that are avoidable.
Extended Data Fig. 3 Age-group contributions to the total value of avoidable mortality and population composition by age in year 2019.
The first bar is the age-group contribution to economic value of avoidable mortality; the second bar is the population composition.
Extended Data Fig. 4 Annual rate of change of country-level mortality rates by age between 2000–2019.
The red line is the mean annual rate of change (AARC) of all countries, the yellow line is the 20th percentile AARC and the blue line is the 10th percentile AARC.
Extended Data Fig. 5 Sensitivity analysis: Avoidable mortality as a percentage of all deaths, 2019.
(A) baseline methods, (B) sex-specific frontier.
Extended Data Fig. 6 One-way sensitivity analyses.
VSL decay methods, discount rate, income elasticity and base VSL.
Supplementary information
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Chang, A.Y., Stevens, G.A., Cardoso, D.S. et al. The economic value of reducing avoidable mortality. Nat Med (2024). https://doi.org/10.1038/s41591-024-03253-7
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DOI: https://doi.org/10.1038/s41591-024-03253-7
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