{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,12]],"date-time":"2025-09-12T19:13:19Z","timestamp":1757704399176},"reference-count":15,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2011,1,7]],"date-time":"2011-01-07T00:00:00Z","timestamp":1294358400000},"content-version":"vor","delay-in-days":6915,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[1992,2]]},"abstract":"<jats:p>Very low birthweight liveborn infants (&lt;1,500 g, VLBW) born in Sweden 1973\u201388 were identified from the Medical Birth Registry and efforts were made to remove wrongly recorded birthweights \u22129% of infants with a registered birth weight below 1,500 g were removed. Some VLBW infants were not recorded in the register and the estimate of the prevalence at birth of VLBW infants is therefore slightly underestimated. It increased from about 5.5 per 1,000 during the period 1973\u201384 to 6.7 per 1,000 during 1987\u201388. 18% of VLBW infants were involved in multiple births. Median Apgar score at 5 min increased for each 100 g birthweight class. Even at a birthweight between 1,400 and 1,499 g. a low Apgar score at 5 min was seen in 20%. The rate of cesarean section increased between 1973 and 1983 from about 10% to 60%. One\u2010year survival for infants with a birthweight &lt;1,000g increased from less than 20% in 1973\u201375 to 50% in the 1986\u201388 cohorts. Corresponding figures for infants with a birthweight between 1,000 and 1,499 g were 60% and 90%. A markedly better one\u2010year survival is already evident in the 600\u2013699 g class. On stratifying for 100 g birthweight class, perinatal death risk was higher in hoys than in girls and higher in multiple births than in singletons. An increased rate of congenital malformations was seen in the 1,000\u20131,499 g class but not in the &lt;1,000 g class.<\/jats:p>","DOI":"10.3109\/00016349209007965","type":"journal-article","created":{"date-parts":[[2007,11,13]],"date-time":"2007-11-13T19:08:59Z","timestamp":1194980939000},"page":"104-111","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["A registry study of very low birthweight liveborn infants in Sweden, 1973\u20131988"],"prefix":"10.1111","volume":"71","author":[{"given":"Anders","family":"Ericson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan","family":"Gunnarskog","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bengt","family":"Kallen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Petra Otterblad","family":"Olausson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,7]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"1038","article-title":"Outcome for infants of very low birthweight: survey of world literature","author":"Stewart A L.","year":"1987","journal-title":"Lancet"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(83)90479-9"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1136\/adc.59.10.987"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(84)92638-2"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-8749.1986.tb03899.x"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00439234"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3476(05)72462-8"},{"key":"e_1_2_1_9_1","first-page":"528","article-title":"Changing prognosis for very low birth weight infants","volume":"74","author":"Ehrenhaft P M.","year":"1989","journal-title":"Obstet Gynecol"},{"key":"e_1_2_1_10_1","doi-asserted-by":"crossref","first-page":"613","DOI":"10.1542\/peds.69.5.613","article-title":"Mortality and morbidity of 500\u2010g to 1,499\u2010g birthweight infants live\u2010born to residents of a defined geographic region before and after neonatal intensive care","volume":"69","author":"Horwood S P.","year":"1982","journal-title":"Pediatrics"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM198207153070303"},{"key":"e_1_2_1_12_1","first-page":"765","article-title":"Improvement of outcome for infants of birthweight under 1,000 g","volume":"66","author":"Callanan C.","year":"1991","journal-title":"Arch Dis Childh"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1001\/archpedi.1985.02140070044030"},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(84)90621-4"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(84)90503-8"},{"key":"e_1_2_1_16_1","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1542\/peds.86.1.27","article-title":"Birthweight less than 800 g\u2014changing outcomes and influences of gender and gestation number","volume":"86","author":"Hoffman E L.","year":"1990","journal-title":"Pediatrics"}],"container-title":["Acta Obstetricia et Gynecologica Scandinavica"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.3109%2F00016349209007965","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/pdf\/10.3109\/00016349209007965","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T09:32:21Z","timestamp":1698053541000},"score":1,"resource":{"primary":{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/10.3109\/00016349209007965"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1992,2]]},"references-count":15,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1992,2]]}},"alternative-id":["10.3109\/00016349209007965"],"URL":"https:\/\/doi.org\/10.3109\/00016349209007965","archive":["Portico"],"relation":{},"ISSN":["0001-6349","1600-0412"],"issn-type":[{"value":"0001-6349","type":"print"},{"value":"1600-0412","type":"electronic"}],"subject":[],"published":{"date-parts":[[1992,2]]},"assertion":[{"value":"2011-01-07","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}