Association between maternal hemoglobin concentration levels and preterm birth clinical subtypes: A retrospective, observational, multicenter study.

PLoS One · 2026 · PMC13170862 · PMID 42127122

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a decreasing trendno p-value reported

These three trajectory groups showed a general parallel trend; the Hb concentration levels among all three groups showed a decreasing trend from the first to the second trimester and a slight increasing trend from the second to the third trimester.

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