Grandmothers and Children's Schooling in Sub-Saharan Africa.

Hum Nat · 2018 · PMC5846866 · PMID 29222651

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highly significantno p-value reported

These variances are highly significant and sizable, indicating that the grandmother effect varies considerably across districts and clusters.

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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.