Association between a single mother family and childhood undervaccination, and mediating effect of household income: a nationwide, prospective birth cohort from the Japan Environment and Children's Study (JECS).

BMC Public Health · 2022 · PMC8764848 · PMID 35038996

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a clear trendno p-value reported

Another Canadian study of 3604 children conducted in 2013 suggested that household income and childhood uptake of measles vaccine did not show a clear trend [ 15 ].

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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.