Population is the main driver of war group size and conflict casualties.

Proc Natl Acad Sci U S A · 2017 · PMC5748198 · PMID 29229847

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highly significantno p-value reported

However, the scaling relationships show clear log–log trends that are highly significant and follow similar scaling relationships observed within biological and social systems ( 13 – 15 , 17 , 18 ).

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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.