{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T18:14:15Z","timestamp":1790100855559,"version":"4.0.1"},"reference-count":27,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2014,1,15]],"date-time":"2014-01-15T00:00:00Z","timestamp":1389744000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Obstet and Gynaecol"],"published-print":{"date-parts":[[2014,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To determine associations of maternal pre\u2010pregnancy underweight with poor outcomes and evaluate how gestational weight gain affects risks for such outcomes in pre\u2010pregnancy underweight Japanese women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>By analyzing the <jats:styled-content style=\"fixed-case\">J<\/jats:styled-content>anuary 2001\u2013<jats:styled-content style=\"fixed-case\">D<\/jats:styled-content>ecember 2012 hospital database, we retrospectively identified 6954 women with pre\u2010pregnancy normal weights (body mass index, 18.5\u201324.9\u2009kg\/m<jats:sup>2<\/jats:sup>) and 1057 pre\u2010pregnancy underweight women (body mass index, &lt;18.5\u2009kg\/m<jats:sup>2<\/jats:sup>) who delivered at the <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content>erinatal <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>aternity and <jats:styled-content style=\"fixed-case\">N<\/jats:styled-content>eonatal <jats:styled-content style=\"fixed-case\">C<\/jats:styled-content>enter of <jats:styled-content style=\"fixed-case\">Y<\/jats:styled-content>okohama City University. These women were stratified by weekly weight gain during the second\/third trimesters to investigate associations of gestational weight gain with spontaneous preterm birth and small for gestational age (<jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content>). Spontaneous preterm birth and <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> incidences were compared with those of women meeting <jats:styled-content style=\"fixed-case\">I<\/jats:styled-content>nstitute of <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>edicine (<jats:styled-content style=\"fixed-case\">IOM<\/jats:styled-content>) guidelines to determine optimal weight gain in Japanese women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Preterm birth and <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> incidences were significantly higher in pre\u2010pregnancy underweight than in pre\u2010pregnancy normal weight women (4.6% vs 2.4% [<jats:italic>P<\/jats:italic>\u2009=\u20090.005] and 13.9% vs 9.7% [<jats:italic>P<\/jats:italic>\u2009=\u20090.003], respectively). For pre\u2010pregnancy normal weight women, preterm birth incidence was significantly higher in those with weight gain of less than 0.2\u2009kg\/week than in those <jats:styled-content style=\"fixed-case\">IOM<\/jats:styled-content> guidelines. For pre\u2010pregnancy underweight women, preterm birth and <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> incidences were significantly higher in those with weight gain of less than 0.3\u2009kg\/week than in those meeting <jats:styled-content style=\"fixed-case\">IOM<\/jats:styled-content> guidelines.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Preterm birth and <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> incidences did not differ significantly between pre\u2010pregnancy normal weight women with weight gain of 0.2\u2009kg\/week or more and pre\u2010pregnancy underweight women with weight gain of 0.3\u2009kg\/week or more, as compared to women meeting <jats:styled-content style=\"fixed-case\">IOM<\/jats:styled-content> guidelines. These results suggest that <jats:styled-content style=\"fixed-case\">IOM<\/jats:styled-content> guidelines for gestational weight gain may lack external validity in <jats:styled-content style=\"fixed-case\">J<\/jats:styled-content>apanese women.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jog.12283","type":"journal-article","created":{"date-parts":[[2014,1,15]],"date-time":"2014-01-15T21:49:53Z","timestamp":1389822593000},"page":"988-994","source":"Crossref","is-referenced-by-count":37,"title":["Associations of maternal pre\u2010pregnancy underweight with small\u2010for\u2010gestational\u2010age and spontaneous preterm birth, and optimal gestational weight gain in <scp>J<\/scp>apanese women"],"prefix":"10.1111","volume":"40","author":[{"given":"Kana","family":"Fujiwara","sequence":"first","affiliation":[{"name":"Perinatal Center for Maternity and Neonatal Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shigeru","family":"Aoki","sequence":"additional","affiliation":[{"name":"Perinatal Center for Maternity and Neonatal Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kentaro","family":"Kurasawa","sequence":"additional","affiliation":[{"name":"Perinatal Center for Maternity and Neonatal Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mika","family":"Okuda","sequence":"additional","affiliation":[{"name":"Perinatal Center for Maternity and Neonatal Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tsuneo","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Perinatal Center for Maternity and Neonatal Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fumiki","family":"Hirahara","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Yokohama City University Hospital  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,1,15]]},"reference":[{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijgo.2012.04.025"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0029-7844(97)00047-1"},{"key":"e_1_2_5_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2012.03345.x"},{"key":"e_1_2_5_5_1","unstructured":"Committee opinion weight gain during pregnancy.The America college of obstetricians and gynecologists. January2012; number 548."},{"key":"e_1_2_5_6_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0054704"},{"key":"e_1_2_5_7_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3182289f42"},{"key":"e_1_2_5_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1447-0756.2012.01848.x"},{"key":"e_1_2_5_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.earlhumdev.2012.10.004"},{"key":"e_1_2_5_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2004.06.071"},{"key":"e_1_2_5_11_1","first-page":"23","article-title":"Maternal underweight and pregnancy outcome: Prospective cohort study","volume":"13","author":"Kanadys W","year":"2007","journal-title":"Arch Perinat Med"},{"key":"e_1_2_5_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10995-010-0633-4"},{"key":"e_1_2_5_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1542-2011.2010.00023.x"},{"key":"e_1_2_5_14_1","doi-asserted-by":"publisher","DOI":"10.1097\/00001703-199402000-00003"},{"key":"e_1_2_5_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(11)60364-4"},{"key":"e_1_2_5_16_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwp101"},{"key":"e_1_2_5_17_1","doi-asserted-by":"publisher","DOI":"10.2471\/BLT.10.077982"},{"key":"e_1_2_5_18_1","volume-title":"Institute of Medicine, Committee to Reexamine IOM Pregnancy Weight Guidelines. Weight Dain During Pregnancy: Reexamining the Guidelines","author":"Rasmussen KM","year":"2009"},{"key":"e_1_2_5_19_1","doi-asserted-by":"publisher","DOI":"10.1155\/2010\/231842"},{"key":"e_1_2_5_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2009.02.047"},{"key":"e_1_2_5_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.annepidem.2010.06.009"},{"key":"e_1_2_5_22_1","doi-asserted-by":"publisher","DOI":"10.1097\/00001648-199903000-00010"},{"key":"e_1_2_5_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0029-7844(00)00883-8"},{"key":"e_1_2_5_24_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000247175.63481.5f"},{"key":"e_1_2_5_25_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00404-010-1740-6"},{"key":"e_1_2_5_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2006.07.031"},{"key":"e_1_2_5_27_1","first-page":"592","article-title":"Pregnant women with low BMI; frequency of preterm labour and lowbirth weight","volume":"18","author":"Urooj U","year":"2011","journal-title":"Prof Med J"},{"key":"e_1_2_5_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2004.06.070"}],"container-title":["Journal of Obstetrics and Gynaecology Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fjog.12283","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fjog.12283","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/jog.12283","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,9,30]],"date-time":"2025-09-30T06:26:41Z","timestamp":1759213601000},"score":1,"resource":{"primary":{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/10.1111\/jog.12283"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,1,15]]},"references-count":27,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2014,4]]}},"alternative-id":["10.1111\/jog.12283"],"URL":"https:\/\/doi.org\/10.1111\/jog.12283","archive":["Portico"],"relation":{},"ISSN":["1341-8076","1447-0756"],"issn-type":[{"value":"1341-8076","type":"print"},{"value":"1447-0756","type":"electronic"}],"subject":[],"published":{"date-parts":[[2014,1,15]]}}}