{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,24]],"date-time":"2026-01-24T14:04:06Z","timestamp":1769263446820,"version":"3.49.0"},"reference-count":43,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2017,4,1]],"date-time":"2017-04-01T00:00:00Z","timestamp":1491004800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["BJOG"],"published-print":{"date-parts":[[2017,10]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>To investigate the independent impact of prepregnancy obesity on preterm delivery among women without chronic diseases by gestational age, preterm category and parity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>A retrospective cohort study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>Data from the Consortium on Safe Labor (CSL) in the USA (2002\u201308).<\/jats:p><\/jats:sec><jats:sec><jats:title>Population<\/jats:title><jats:p>Singleton deliveries at \u226523 weeks of gestation in the CSL (43 200 nulliparas and 63 129 multiparas) with a prepregnancy body mass index (BMI) \u226518.5 kg\/m<jats:sup>2<\/jats:sup> and without chronic diseases.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Association of prepregnancy BMI and the risk of preterm delivery was examined using Poisson regression with normal weight as reference.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main outcome measures<\/jats:title><jats:p>Preterm deliveries were categorised by gestational age (extremely, very, moderate to late) and category (spontaneous, indicated, no recorded indication).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Relative risk of spontaneous preterm delivery was increased for extremely preterm among obese nulliparas (1.26, 95% CI: 0.94\u20131.70 for overweight; 1.88, 95% CI: 1.30\u20132.71 for obese class I; 1.99, 95% CI: 1.32\u20133.01 for obese class II\/III) and decreased for moderate to late preterm delivery among overweight and obese multiparas (0.90, 95% CI: 0.83\u20130.97 for overweight; 0.87, 95% CI: 0.78\u20130.97 for obese class I; 0.79, 95% CI: 0.69\u20130.90 for obese class II\/III). Indicated preterm delivery risk was increased with prepregnancy BMI in a dose\u2013response manner for extremely preterm and moderate to late preterm among nulliparas, as it was for moderate to late preterm delivery among multiparas.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Prepregnancy BMI was associated with increased risk of preterm delivery even in the absence of chronic diseases, but the association was heterogeneous by preterm categories, gestational age and parity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Tweetable abstract<\/jats:title><jats:p>Obese nulliparas without chronic disease had higher risk for spontaneous delivery &lt;28 weeks of gestation.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.14613","type":"journal-article","created":{"date-parts":[[2017,2,25]],"date-time":"2017-02-25T01:22:41Z","timestamp":1487985761000},"page":"1708-1716","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Spontaneous and indicated preterm delivery risk is increased among overweight and obese women without prepregnancy chronic disease"],"prefix":"10.1111","volume":"124","author":[{"given":"SS","family":"Kim","sequence":"first","affiliation":[{"name":"Epidemiology Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA"},{"name":"Division of Epidemiology and Health Index Korea National Institute of Health Cheongju\u2010si Chungcheongbuk\u2010do Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P","family":"Mendola","sequence":"additional","affiliation":[{"name":"Epidemiology Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Y","family":"Zhu","sequence":"additional","affiliation":[{"name":"Epidemiology Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA"},{"name":"Division of Research Kaiser Permanente Northern California Oakland CA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"BS","family":"Hwang","sequence":"additional","affiliation":[{"name":"Biostatistics and Bioinformatics Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA"},{"name":"Department of Applied Statistics Chung\u2010Ang University Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"KL","family":"Grantz","sequence":"additional","affiliation":[{"name":"Epidemiology Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,4]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(08)60136-1"},{"key":"e_1_2_7_3_1","first-page":"1","article-title":"International comparisons of infant mortality and related factors: United States and Europe, 2010","volume":"63","author":"MacDorman MF","year":"2014","journal-title":"Natl Vital Stat Rep"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1403489"},{"key":"e_1_2_7_5_1","first-page":"1","article-title":"Infant mortality statistics from the 2010 period linked birth\/infant death data set","volume":"62","author":"Matthews TJ","year":"2013","journal-title":"Natl Vital Stat Rep"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3182245d49"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.5694\/mja11.11120"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2010.02593.x"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.2105\/AJPH.91.3.436"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2009.113"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.3109\/14767050903042561"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.2105\/AJPH.2005.074294"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.3109\/14767051003678044"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.g2301"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.ajkd.2014.11.019"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10995-015-1763-5"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2010.06.058"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(12)60820-4"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3181f73f97"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1177\/0962280211427759"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.b2393"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2013.6295"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3016.2007.00762.x"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2012.06.002"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0060660"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2004.09.021"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2393-14-153"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2393-13-120"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-0029-1241736"},{"key":"e_1_2_7_30_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwn092"},{"key":"e_1_2_7_31_1","doi-asserted-by":"publisher","DOI":"10.1080\/00016340801996838"},{"key":"e_1_2_7_32_1","doi-asserted-by":"publisher","DOI":"10.1111\/ppe.12125"},{"key":"e_1_2_7_33_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2006.01120.x"},{"key":"e_1_2_7_34_1","first-page":"622","article-title":"Histologic chorioamnionitis and preterm delivery in different patient populations","volume":"75","author":"Mueller\u2010Heubach E","year":"1990","journal-title":"Obstet Gynecol"},{"key":"e_1_2_7_35_1","doi-asserted-by":"publisher","DOI":"10.1038\/oby.2006.20"},{"key":"e_1_2_7_36_1","doi-asserted-by":"publisher","DOI":"10.1111\/aji.12265"},{"key":"e_1_2_7_37_1","doi-asserted-by":"publisher","DOI":"10.1080\/00016340701515423"},{"key":"e_1_2_7_38_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.2002-020311"},{"key":"e_1_2_7_39_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwm273"},{"key":"e_1_2_7_40_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jri.2008.08.006"},{"key":"e_1_2_7_41_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.2006-2083"},{"key":"e_1_2_7_42_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199602293340904"},{"key":"e_1_2_7_43_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2015.02.032"},{"key":"e_1_2_7_44_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3182255999"}],"container-title":["BJOG: An International Journal of Obstetrics &amp; Gynaecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2F1471-0528.14613","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/1471-0528.14613","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,10]],"date-time":"2023-09-10T02:08:08Z","timestamp":1694311688000},"score":1,"resource":{"primary":{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/10.1111\/1471-0528.14613"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,4]]},"references-count":43,"journal-issue":{"issue":"11","published-print":{"date-parts":[[2017,10]]}},"alternative-id":["10.1111\/1471-0528.14613"],"URL":"https:\/\/doi.org\/10.1111\/1471-0528.14613","archive":["Portico"],"relation":{},"ISSN":["1470-0328","1471-0528"],"issn-type":[{"value":"1470-0328","type":"print"},{"value":"1471-0528","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,4]]},"assertion":[{"value":"2017-02-15","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2017-04-01","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}