Haemoglobin and red blood cell reference intervals during infancy.

Arch Dis Child · 2022 · PMC8938674 · PMID 34674992

Europe PMC DOI

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a decreasing trendno p-value reported

Regarding Ret-He, both the 2.5th and the 97.5th percentiles showed a decreasing trend from birth (umbilical cord blood) to 4 months of age.

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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.