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Sci."],"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>There is limited and inconsistent evidence that imply a relationship between ABO blood types and rate of preterm birth (PTB). We aim to examine the association between maternal ABO blood group and PTB rate. A retrospective-study conducted at a university teaching institution on data collected between 2013 and 2019. Women who delivered a viable neonate at \u2265\u200924 weeks without major malformations were included. Indicated PTBs were excluded. PTB and early PTB were defined as deliveries that occurred\u2009&lt;\u200937 and &lt;\u200934 weeks respectively. PTB was further divided into 3 subgroups according to etiology: membranes rupture, intact membranes, and placental abruption regardless of membranes\u2019 status. The primary outcome was spontaneous PTB rate. Of 19,301 women included, PTB and early PTB rates were 7.3% (1,418\/19,301) and 2.3% (440\/19,301) respectively. Rates of PTB in blood groups A, B, O, and AB, were 7.3%, 6.9%, 7.5%, and 7.5% respectively (<jats:italic>p<\/jats:italic>\u2009=\u20090.68). There was no significant difference according to etiology. Rates of early PTB were also comparable (<jats:italic>p<\/jats:italic>\u2009=\u20090.63). After adjustment for demographic and obstetric variables, blood type was associated with increased placental abruption rate among women who had early PTB (<jats:italic>p<\/jats:italic>\u2009=\u20090.038). Placental abruption rate was significantly higher in group A (22.5%) compared to group B (14.1%), (adjusted <jats:italic>p<\/jats:italic>\u2009=\u20090.04) and group O (14.0%), (adjusted <jats:italic>p<\/jats:italic>\u2009=\u20090.01). The rate in group AB was 17.1%, (adjusted <jats:italic>p<\/jats:italic>\u2009=\u20090.85). In conclusion, no association was found between a particular blood group and PTB rate. Women with group A, admitted in early PTB, had an increased risk that the underlying etiology was placental abruption.<\/jats:p>","DOI":"10.1007\/s43032-024-01705-6","type":"journal-article","created":{"date-parts":[[2024,9,28]],"date-time":"2024-09-28T21:01:29Z","timestamp":1727557289000},"page":"3697-3704","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The Association Between Maternal ABO Blood Group and the Occurrence of Spontaneous Preterm Birth: A Retrospective Population-Based Cohort Study"],"prefix":"10.1007","volume":"31","author":[{"given":"Eyal","family":"Rom","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manal","family":"Massalha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Offer","family":"Erez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3603-8452","authenticated-orcid":false,"given":"Raed","family":"Salim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,28]]},"reference":[{"key":"1705_CR1","unstructured":"World Health Organization. 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