{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T06:29:07Z","timestamp":1791354547772,"version":"4.3.1"},"reference-count":20,"publisher":"American Academy of Pediatrics (AAP)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2009,2,1]]},"abstract":"<jats:p>OBJECTIVE. Our goal was to investigate the neonatal mortality rate and the mortality rate during the NICU stay for extremely low birth weight infants born in Japan in 2005.<\/jats:p>\n               <jats:p>METHODS. The Committee of Neonatal Medicine of the Japan Pediatric Society retrospectively surveyed the deaths of extremely low birth weight infants born and hospitalized between January 1 and December 31, 2005. From 297 institutions in Japan, data on 3065 extremely low birth weight infants, which represented 98.4% of those reported in the maternal and health statistics of Japan in 2005, were collected.<\/jats:p>\n               <jats:p>RESULTS. The neonatal mortality rate and the mortality rate during the NICU stay were 13.0% and 17.0%, respectively, which were lower than 17.7% and 21.5% in the survey in 2000. The neonatal mortality rates and the mortality rates during the NICU stay were 53.3% and 67.7% in the &amp;lt;400-g birth weight group (n = 62), 42.1% and 53.5% in the 400- to 499-g birth weight group (n = 159), 22.2% and 27.7% in the 500- to 599-g birth weight group (n = 387), 16.8% and 22.2% in the 600- to 699-g birth weight group (n = 537), 9.4% and 12.7% in the 700- to 799-g birth weight group (n = 574), 6.3% and 9.1% in the 800- to 899-g birth weight group (n = 649), and 3.9% and 5.3% in the 900- to 999-g birth weight group (n = 697), respectively. The factors involved in the deaths of extremely low birth weight infants included lower gestational age, lower birth weight, male gender, multiple birth, institutions in which &amp;lt;10 extremely low birth weight infants were admitted per year, and no prenatal maternal transfer.<\/jats:p>\n               <jats:p>CONCLUSION. The mortality rates of extremely low birth weight infants who were born in 2005 demonstrated definite improvement.<\/jats:p>","DOI":"10.1542\/peds.2008-0763","type":"journal-article","created":{"date-parts":[[2009,1,26]],"date-time":"2009-01-26T12:23:44Z","timestamp":1232972624000},"page":"445-450","source":"Crossref","is-referenced-by-count":183,"title":["Mortality Rates for Extremely Low Birth Weight Infants Born in Japan in 2005"],"prefix":"10.1542","volume":"123","author":[{"given":"Kazuo","family":"Itabashi","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Showa University School of Medicine, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takeshi","family":"Horiuchi","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, St Marianna University School of Medicine, Kawasaki, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi","family":"Kusuda","sequence":"additional","affiliation":[{"name":"Department of Neonatology, Maternal and Perinatal Center, Tokyo Women's Medical University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuhiko","family":"Kabe","sequence":"additional","affiliation":[{"name":"Department of Neonatology, Maternal and Child Health Center, Aiiku Hospital, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasufumi","family":"Itani","sequence":"additional","affiliation":[{"name":"Department of Neonatology, Kanagawa Children's Medical Center, Yokohama, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Department of Human Welfare, Faculty of Human Science, Taisyo University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masanori","family":"Fujimura","sequence":"additional","affiliation":[{"name":"Department of Neonatology, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masafumi","family":"Matsuo","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Kobe University School of Medicine, Kobe, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"417","published-online":{"date-parts":[[2009,2,1]]},"reference":[{"key":"2021120822551980200_R1","unstructured":"Japan Pediatric Society, Committee of Neonatal Medicine, Subcommittee for the Survey on High Risk Newborns. 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