Payback time? Influence of having children on mortality in old age.

J Epidemiol Community Health · 2017 · PMC5484032 · PMID 28292784

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an overall trendno p-value reported

In Sweden and the other Nordic countries, 5 there is an overall trend of increasing levels of childlessness across birth cohorts.

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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.