A Multi-country Study of the Household Willingness-to-Pay for Dengue Vaccines: Household Surveys in Vietnam, Thailand, and Colombia.

PLoS Negl Trop Dis · 2015 · PMC4452082 · PMID 26030922

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highly significantno p-value reported

Income per capita (in log form) is also highly significant across countries with positive signs indicating that vaccine demand increases with income.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.