{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T23:04:14Z","timestamp":1785539054856,"version":"3.56.0"},"reference-count":36,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2011,8,22]],"date-time":"2011-08-22T00:00:00Z","timestamp":1313971200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["BJOG"],"published-print":{"date-parts":[[2011,11]]},"abstract":"<jats:p><jats:italic>Please cite this paper as:<\/jats:italic> Cheng Y, Kaimal A, Bruckner T, Hallaron D, Caughey A. Perinatal morbidity associated with late preterm deliveries compared with deliveries between 37 and 40\u2003weeks of gestation. BJOG 2011;118:1446\u20131454.<\/jats:p><jats:p><jats:bold>Objective\u2002<\/jats:bold> To estimate the risk of short\u2010term complications in neonates born between 34 and 36\u2003weeks of gestation.<\/jats:p><jats:p><jats:bold>Design\u2002<\/jats:bold> This is a retrospective cohort study.<\/jats:p><jats:p><jats:bold>Setting\u2002<\/jats:bold> Deliveries in 2005 in the USA.<\/jats:p><jats:p><jats:bold>Population\u2002<\/jats:bold> Singleton live births between 34 and 40\u2003weeks of gestation.<\/jats:p><jats:p><jats:bold>Methods\u2002<\/jats:bold> Gestational age was subgrouped into 34, 35, 36 and 37\u201340 completed weeks of gestation. Statistical comparisons were performed using chi\u2010square test and multivariable logistic regression models, with 37\u201340\u2003weeks of gestation designated as referent.<\/jats:p><jats:p><jats:bold>Main outcome measures\u2002<\/jats:bold> Perinatal morbidities, including 5\u2010minute Apgar scores, hyaline membrane disease, neonatal sepsis\/antibiotics use, and admission to the intensive care unit.<\/jats:p><jats:p><jats:bold>Results\u2002<\/jats:bold> In all, 175\u2003112 neonates were born between 34 and 36\u2003weeks in 2005. Compared with neonates born between 37 and 40\u2003weeks, neonates born at 34\u2003weeks had higher odds of 5\u2010minute Apgar &lt;7 (adjusted odds ratio [aOR] 5.51, 95% CI 5.16\u20135.88), hyaline membrane disease (aOR 10.2, 95% CI 9.44\u201310.9), mechanical ventilation use &gt;6\u2003hours (aOR 9.78, 95% CI 8.99\u201310.6) and antibiotic use (aOR 9.00, 95% CI 8.43\u20139.60). Neonates born at 35\u2003weeks were similarly at risk of morbidity, with higher odds of 5\u2010minute Apgar &lt;7 (aOR 3.42, 95% CI 3.23\u20133.63), surfactant use (aOR 3.74, 95% CI 3.21\u20134.22), ventilation use &gt;6\u2003hours (aOR 5.53, 95% CI 5.11\u20135.99) and neonatal intensive\u2010care unit admission (aOR 11.3, 95% CI 11.0\u201311.7). Neonates born at 36\u2003weeks remain at higher risk of morbidity compared with deliveries at 37\u201340\u2003weeks of gestation.<\/jats:p><jats:p><jats:bold>Conclusions\u2002<\/jats:bold> Although the risk of undesirable neonatal outcomes decreases with increasing gestational age, the risk of neonatal complications in late preterm births remains higher compared with infants delivered at 37\u201340\u2003weeks of gestation.<\/jats:p>","DOI":"10.1111\/j.1471-0528.2011.03045.x","type":"journal-article","created":{"date-parts":[[2011,8,24]],"date-time":"2011-08-24T06:20:48Z","timestamp":1314166848000},"page":"1446-1454","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":55,"title":["Perinatal morbidity associated with late preterm deliveries compared with deliveries between 37 and 40\u2003weeks of gestation"],"prefix":"10.1111","volume":"118","author":[{"given":"YW","family":"Cheng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"AJ","family":"Kaimal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"TA","family":"Bruckner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"DR","family":"Hallaron","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"AB","family":"Caughey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,8,22]]},"reference":[{"key":"e_1_2_11_2_2","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2006-0018"},{"key":"e_1_2_11_3_2","first-page":"1","article-title":"Centers for Disease Control and Prevention National Center for Health Statistics National Vital Statistics System. 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