{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T03:35:28Z","timestamp":1792812928815,"version":"4.5.0"},"reference-count":25,"publisher":"American Academy of Pediatrics (AAP)","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2017,3,1]]},"abstract":"<jats:sec><jats:title>OBJECTIVE:<\/jats:title><jats:p>To determine 1-year survival and major neonatal morbidities (intracranial hemorrhage grade &amp;gt;2, cystic periventricular leukomalacia, retinopathy of prematurity grade &amp;gt;2, necrotizing enterocolitis, severe bronchopulmonary dysplasia) among extremely preterm infants in Norway in 2013\u20132014, and to compare the results to the first Norwegian Extreme Prematurity Study 1999\u20132000 and similar contemporary European population-based studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS:<\/jats:title><jats:p>Population-based study of all infants born at 22 through 26 weeks\u2019 gestation in Norway in 2013\u20132014. Prospectively collected data were obtained by linking data in the Norwegian Neonatal Network to the Medical Birth Registry of Norway.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS:<\/jats:title><jats:p>Of 420 infants (incidence 3.5 per 1000 births), 145 were stillborn (34.5%), 275 were live-born (82.3% of the 334 fetuses alive at admission for obstetrical care), and 251 (91.3% of live-born infants) were admitted to a neonatal unit. The survival among live-born infants was 18% at 22 weeks, 29% at 23 weeks, 56% at 24 weeks, 84% at 25 weeks and 90% at 26 weeks (for each week increment in gestational age: odds ratio 3.3; 95% confidence interval, 2.4\u20134.4). Among infants surviving to 1 year of age, major neonatal morbidity was diagnosed in 55%. Decreasing gestational age was moderately associated with rates of major morbidity (odds ratio 1.6; 95% confidence interval, 1.2\u20132.2).<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS:<\/jats:title><jats:p>Compared to the previous 1999\u20132000 cohort, the rate of stillbirth before admission to an obstetrical unit increased, whereas the survival rate among live born infants was similar in our 2013\u20132014 cohort. Neonatal morbidity rates remain high among extremely preterm infants.<\/jats:p><\/jats:sec>","DOI":"10.1542\/peds.2016-1821","type":"journal-article","created":{"date-parts":[[2017,2,23]],"date-time":"2017-02-23T10:10:12Z","timestamp":1487844612000},"source":"Crossref","is-referenced-by-count":129,"title":["Neonatal Morbidity and 1-Year Survival of Extremely Preterm Infants"],"prefix":"10.1542","volume":"139","author":[{"given":"Hans Jorgen","family":"Stensvold","sequence":"first","affiliation":[{"name":"Division of Paediatric and Adolescent Medicine, Neonatal Department, and"},{"name":"Norwegian Neonatal Network, Oslo University Hospital, Oslo, Norway;"},{"name":"Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Norway;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claus","family":"Klingenberg","sequence":"additional","affiliation":[{"name":"Division of Child and Adolescent Health. 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