A critical review of anthropological studies on skeletons from European plague pits of different epochs.

Sci Rep · 2018 · PMC6281611 · PMID 30518882

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highly significantno p-value reported

As for the two classes of age at death, the differences among periods were statistically highly significant (Chi-square test, p = <0.001).

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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.