Oedema in kwashiorkor is caused by hypoalbuminaemia.

Paediatr Int Child Health · 2015 · PMC4462841 · PMID 25223408

Europe PMC DOI

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The sentences

highly significantno p-value reported

9 As with graph (a), every study in which the data could be evaluated statistically showed a significant increase on feeding, and the combined means showed a highly significant improvement.

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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.