{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T19:20:58Z","timestamp":1791487258652,"version":"4.3.4"},"reference-count":17,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2022,11,11]],"date-time":"2022-11-11T00:00:00Z","timestamp":1668124800000},"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":["J of Obstet and Gynaecol"],"published-print":{"date-parts":[[2023,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aims<\/jats:title><jats:p>To evaluate the perinatal outcomes by gestational weight gain (GWG) range at 30\u2009weeks of gestation among underweight pregnant women (pre\u2010pregnancy body mass index\u2009\u2264\u200918.5\u2009kg\/m<jats:sup>2<\/jats:sup>) in Japan.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This retrospective study was conducted at a hospital in Japan from 2003 to 2020. The underweight pregnant women (UPW; <jats:italic>n<\/jats:italic>\u00a0=\u20093643) were divided into quartile groups based on the weight gain at 30\u2009weeks of gestation: group Q1\u2009\u2264\u20095.7\u00a0kg, 5.7\u00a0kg\u2009&lt;\u2009Q2\u2009\u2264\u20097.2\u00a0kg, 7.2\u00a0kg\u2009&lt;\u2009Q3\u2009\u2264\u20098.8\u00a0kg, and 8.8\u00a0kg\u2009&lt;\u2009Q4. Clinical characteristics and outcomes were compared using the <jats:italic>t<\/jats:italic>\u2010test, chi\u2010square test, and multivariable logistic regression analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The cumulative incidences of preterm births were 7.5% (<jats:italic>n<\/jats:italic>\u00a0=\u200970), 5.0% (<jats:italic>n<\/jats:italic>\u00a0=\u200945), 5.4% (<jats:italic>n<\/jats:italic>\u00a0=\u200950), and 4.9% (<jats:italic>n<\/jats:italic>\u00a0=\u200944), and the birth rates of small for gestational age (SGA) infants were 15.7% (<jats:italic>n<\/jats:italic>\u00a0=\u2009147), 9.6% (<jats:italic>n<\/jats:italic>\u00a0=\u200987), 6.9% (<jats:italic>n<\/jats:italic>\u00a0=\u200964), and 5.9% (<jats:italic>n<\/jats:italic>\u00a0=\u200953) in Q1, Q2, Q3, and Q4, respectively. Multivariable analysis revealed that Q1 was significantly associated with preterm births (adjusted odds ratio [aOR]\u00a0=\u00a01.6; 95% confidence interval [CI]\u00a0=\u00a01.0\u20132.3), and Q1 and Q2 were significantly associated with SGA (adj. OR\u00a0=\u00a03.0; 95% CI\u00a0=\u00a02.2\u20134.3; adj. OR\u00a0=\u00a01.7; 95% CI\u00a0=\u00a01.2\u20132.5, respectively). None of the quartile groups were significantly associated with the incidence of primary cesarean sections, gestational diabetes mellitus, and macrosomia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>In UPW, GWG at 30\u2009weeks of \u22645.7\u00a0kg and \u22647.2\u00a0kg are associated with preterm birth and SGA rates, respectively.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jog.15490","type":"journal-article","created":{"date-parts":[[2022,11,11]],"date-time":"2022-11-11T08:58:55Z","timestamp":1668157135000},"page":"635-640","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["The perinatal outcomes by gestational weight gain range at 30\u2009weeks of gestation among pre\u2010pregnancy underweight women"],"prefix":"10.1111","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6056-8824","authenticated-orcid":false,"given":"Takeshi","family":"Nagao","sequence":"first","affiliation":[{"name":"Department of Integrated Women's Health St. Luke's International Hospital  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sho","family":"Fukui","sequence":"additional","affiliation":[{"name":"Immuno\u2010Rheumatology Center St. Luke's International Hospital  Tokyo Japan"},{"name":"Center for Clinical Epidemiology St. Luke's International University  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sachiko","family":"Ohde","sequence":"additional","affiliation":[{"name":"Center for Clinical Epidemiology St. Luke's International University  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michiko","family":"Yamanaka","sequence":"additional","affiliation":[{"name":"Department of Integrated Women's Health St. Luke's International Hospital  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,11,11]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000279450.85198.b2"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2017.3635"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-9378(03)00860-3"},{"key":"e_1_2_8_5_1","unstructured":"The Japan Society of Obstetrics and Gynecology.Guideline for obstetrical practice in Japan. 2020."},{"key":"e_1_2_8_6_1","volume-title":"Weight gain during pregnancy: reexamining the guidelines","author":"Rasmussen KM","year":"2009"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.361.6401.440"},{"key":"e_1_2_8_8_1","volume-title":"Vital statistics","author":"Statistics and Information 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