{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T15:29:03Z","timestamp":1789226943831,"version":"build-2803163510"},"reference-count":42,"publisher":"Elsevier BV","issue":"4","license":[{"start":{"date-parts":[[2015,4,1]],"date-time":"2015-04-01T00:00:00Z","timestamp":1427846400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2015,4,1]],"date-time":"2015-04-01T00:00:00Z","timestamp":1427846400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"},{"start":{"date-parts":[[2022,5,27]],"date-time":"2022-05-27T00:00:00Z","timestamp":1653609600000},"content-version":"vor","delay-in-days":2613,"URL":"http:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":["clinicalkey.com","clinicalkey.com.au","clinicalkey.es","clinicalkey.fr","clinicalkey.jp","fertstert.org","elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["Fertility and Sterility"],"published-print":{"date-parts":[[2015,4]]},"DOI":"10.1016\/j.fertnstert.2015.01.024","type":"journal-article","created":{"date-parts":[[2015,2,20]],"date-time":"2015-02-20T11:48:55Z","timestamp":1424432935000},"page":"1065-1073.e2","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":33,"title":["Prospective study of time to\u00a0pregnancy and adverse birth outcomes"],"prefix":"10.1016","volume":"103","author":[{"given":"Lauren A.","family":"Wise","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ellen M.","family":"Mikkelsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henrik Toft","family":"S\u00f8rensen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth J.","family":"Rothman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristen A.","family":"Hahn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anders H.","family":"Riis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth E.","family":"Hatch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/j.fertnstert.2015.01.024_bib1","doi-asserted-by":"crossref","first-page":"967","DOI":"10.1097\/01.AOG.0000259316.04136.30","article-title":"Infertility, assisted reproductive technology, and adverse pregnancy outcomes: executive summary of a National Institute of Child Health and Human Development workshop","volume":"109","author":"Reddy","year":"2007","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib2","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1016\/j.ejogrb.2009.05.035","article-title":"Preterm birth and low birth weight among in\u00a0vitro fertilization singletons: a systematic review and meta-analyses","volume":"146","author":"McDonald","year":"2009","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib3","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1111\/j.1749-6632.1988.tb22237.x","article-title":"The Australian Register: current research and future role. A preliminary report","volume":"541","author":"Saunders","year":"1988","journal-title":"Ann N Y Acad Sci"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib4","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1093\/humrep\/des347","article-title":"Infertility and the risk of adverse pregnancy outcomes: a systematic review and meta-analysis","volume":"28","author":"Messerlian","year":"2013","journal-title":"Hum Reprod"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib5","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/S0015-0282(16)56818-6","article-title":"Association of time to pregnancy and the outcome of pregnancy","volume":"62","author":"Joffe","year":"1994","journal-title":"Fertil Steril"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib6","doi-asserted-by":"crossref","first-page":"594","DOI":"10.1016\/S0029-7844(97)00045-8","article-title":"Time to pregnancy and preterm delivery","volume":"89","author":"Henriksen","year":"1997","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib7","doi-asserted-by":"crossref","first-page":"2478","DOI":"10.1093\/humrep\/deg444","article-title":"Infertility and preterm delivery, birthweight, and Caesarean section: a study within the Danish National Birth Cohort","volume":"18","author":"Basso","year":"2003","journal-title":"Hum Reprod"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib8","doi-asserted-by":"crossref","first-page":"632","DOI":"10.1111\/j.1471-0528.2004.00489.x","article-title":"Obstetric outcome in women with subfertility","volume":"112","author":"Thomson","year":"2005","journal-title":"BJOG"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib9","doi-asserted-by":"crossref","first-page":"737","DOI":"10.1016\/S0140-6736(08)61041-7","article-title":"Effects of technology or maternal factors on perinatal outcome after assisted fertilisation: a population-based cohort study","volume":"372","author":"Romundstad","year":"2008","journal-title":"Lancet"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib10","doi-asserted-by":"crossref","first-page":"2593","DOI":"10.1093\/humrep\/16.12.2593","article-title":"Review of unexplained infertility and obstetric outcome: a 10 year review","volume":"16","author":"Pandian","year":"2001","journal-title":"Hum Reprod"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib11","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1093\/aje\/kwf194","article-title":"Subfecundity as a correlate of preeclampsia: a study within the Danish National Birth Cohort","volume":"157","author":"Basso","year":"2003","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib12","first-page":"44","article-title":"Viable pregnancy after prolonged periods of secondary infertility","volume":"50","author":"Glietenberg","year":"1976","journal-title":"S Afr Med J"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib13","doi-asserted-by":"crossref","first-page":"2674","DOI":"10.1016\/j.fertnstert.2010.02.043","article-title":"Adverse obstetric and perinatal outcomes in subfertile women conceiving without assisted reproductive technologies","volume":"94","author":"Jaques","year":"2010","journal-title":"Fertil Steril"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib14","doi-asserted-by":"crossref","first-page":"1312","DOI":"10.1093\/humrep\/deq023","article-title":"IVF and stillbirth: a prospective follow-up study","volume":"25","author":"Wisborg","year":"2010","journal-title":"Hum Reprod"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib15","doi-asserted-by":"crossref","first-page":"938","DOI":"10.1093\/ije\/dyn191","article-title":"Cohort profile: the Danish Web-based Pregnancy Planning Study\u2014\u2018Snart-Gravid\u2019","volume":"38","author":"Mikkelsen","year":"2009","journal-title":"Int J Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib16","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1097\/EDE.0b013e31818f2e96","article-title":"Randomized trial of questionnaire length","volume":"20","author":"Rothman","year":"2009","journal-title":"Epidemiology"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib17","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1007\/s10654-010-9431-y","article-title":"A successful implementation of e-epidemiology: the Danish pregnancy planning study \u2018Snart-Gravid\u2019","volume":"25","author":"Huybrechts","year":"2010","journal-title":"Eur J Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib18","doi-asserted-by":"crossref","first-page":"2398","DOI":"10.1126\/science.287.5462.2398","article-title":"When an entire country is a cohort","volume":"287","author":"Frank","year":"2000","journal-title":"Science"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib19","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1249\/00005768-199301000-00012","article-title":"A simultaneous evaluation of 10 commonly used physical activity questionnaires","volume":"25","author":"Jacobs","year":"1993","journal-title":"Med Sci Sports Exerc"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib20","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1093\/humrep\/dep360","article-title":"An internet-based prospective study of body size and time-to-pregnancy","volume":"25","author":"Wise","year":"2010","journal-title":"Hum Reprod"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib21","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1053\/j.semperi.2014.03.001","article-title":"Ischemic placental disease: a unifying concept for preeclampsia, intrauterine growth restriction, and placental abruption","volume":"38","author":"Ananth","year":"2014","journal-title":"Semin Perinatol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib22","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.ejogrb.2011.07.025","article-title":"Ischemic placental disease: epidemiology and risk factors","volume":"159","author":"Ananth","year":"2011","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib23","doi-asserted-by":"crossref","first-page":"843","DOI":"10.1111\/j.1651-2227.1996.tb14164.x","article-title":"Intrauterine growth curves based on ultrasonically estimated foetal weights","volume":"85","author":"Marsal","year":"1996","journal-title":"Acta Paediatr"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib24","unstructured":"Sundhedsstyrelsen. Vejledning om l\u00e6gers anvendelse afkunstig befrugtning o.a. reproduktions-fremmende behandling\u00a02006. Clinical guidelines regarding physicians' use of assisted reproductive technologies, 2006. Danish National Board of Health, December 2006."},{"key":"10.1016\/j.fertnstert.2015.01.024_bib25","doi-asserted-by":"crossref","first-page":"491","DOI":"10.1111\/ppe.12073","article-title":"Accuracy loss due to selection bias in cohort studies with left truncation","volume":"27","author":"Schisterman","year":"2013","journal-title":"Paediatr Perinat Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib26","doi-asserted-by":"crossref","first-page":"1541","DOI":"10.1002\/sim.689","article-title":"Multiple imputation in public health research","volume":"20","author":"Zhou","year":"2001","journal-title":"Stat Med"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib27","series-title":"SAS\/STAT 9.2 user's guide","year":"2008"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib28","doi-asserted-by":"crossref","first-page":"990","DOI":"10.1093\/aje\/kwn193","article-title":"Invited commentary: disaggregating preterm birth to determine etiology","volume":"168","author":"Savitz","year":"2008","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib29","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1097\/00001648-199805000-00011","article-title":"Risk factors for preterm birth subtypes","volume":"9","author":"Berkowitz","year":"1998","journal-title":"Epidemiology"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib30","doi-asserted-by":"crossref","first-page":"428","DOI":"10.1097\/00001648-199209000-00008","article-title":"Preterm birth subtypes among blacks and whites","volume":"3","author":"Zhang","year":"1992","journal-title":"Epidemiology"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib31","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1111\/j.1365-3016.2005.00637.x","article-title":"Should spontaneous and medically indicated preterm births be separated for studying aetiology?","volume":"19","author":"Savitz","year":"2005","journal-title":"Paediatr Perinat Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib32","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1097\/OGX.0b013e3182685870","article-title":"Abnormal placentation: evidence-based diagnosis and management of placenta previa, placenta accreta, and vasa previa","volume":"67","author":"Rao","year":"2012","journal-title":"Obstet Gynecol Surv"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib33","doi-asserted-by":"crossref","first-page":"113","DOI":"10.3109\/09513590.2012.706669","article-title":"Increased risk of placenta previa is associated with endometriosis and tubal factor infertility in assisted reproductive technology pregnancy","volume":"29","author":"Takemura","year":"2013","journal-title":"Gynecol Endocrinol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib34","doi-asserted-by":"crossref","first-page":"1368","DOI":"10.1213\/ANE.0b013e3181d74898","article-title":"The epidemiology of postpartum hemorrhage in a large, nationwide sample of deliveries","volume":"110","author":"Bateman","year":"2010","journal-title":"Anesth Analg"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib35","doi-asserted-by":"crossref","first-page":"893","DOI":"10.1016\/0895-4356(96)00018-2","article-title":"Validation of the Danish Birth Registration","volume":"49","author":"Kristensen","year":"1996","journal-title":"J Clin Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib36","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1016\/j.ejogrb.2013.10.033","article-title":"Use of ICD-10 codes to monitor uterine rupture: validation of a national birth registry","volume":"173","author":"Thisted","year":"2014","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib37","doi-asserted-by":"crossref","first-page":"701","DOI":"10.1093\/aje\/kwr130","article-title":"A prospective cohort study of menstrual characteristics and time to pregnancy","volume":"174","author":"Wise","year":"2011","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib38","doi-asserted-by":"crossref","first-page":"1724","DOI":"10.1016\/S0140-6736(99)90050-8","article-title":"Why might infertile couples have problem pregnancies?","volume":"353","author":"Baird","year":"1999","journal-title":"Lancet"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib39","first-page":"630","article-title":"Lifestyle and environmental contribution to male infertility","volume":"56","author":"Sharpe","year":"2000","journal-title":"Br\u00a0Med Bull"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib40","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/S0140-6736(08)60074-4","article-title":"Epidemiology and causes of preterm birth","volume":"371","author":"Goldenberg","year":"2008","journal-title":"Lancet"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib41","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1046\/j.1365-3016.2001.00012.x","article-title":"Socio-economic disparities in preterm birth: causal pathways and mechanisms","volume":"15","author":"Kramer","year":"2001","journal-title":"Paediatr Perinat Epidemiol"},{"key":"10.1016\/j.fertnstert.2015.01.024_bib42","doi-asserted-by":"crossref","first-page":"e35","DOI":"10.1542\/peds.108.2.e35","article-title":"A new and improved population-based Canadian reference for birth weight for gestational age","volume":"108","author":"Kramer","year":"2001","journal-title":"Pediatrics"}],"container-title":["Fertility and Sterility"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0015028215000710?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0015028215000710?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T08:17:22Z","timestamp":1758010642000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0015028215000710"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,4]]},"references-count":42,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2015,4]]}},"alternative-id":["S0015028215000710"],"URL":"https:\/\/doi.org\/10.1016\/j.fertnstert.2015.01.024","relation":{},"ISSN":["0015-0282"],"issn-type":[{"value":"0015-0282","type":"print"}],"subject":[],"published":{"date-parts":[[2015,4]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"Prospective study of time to\u00a0pregnancy and adverse birth outcomes","name":"articletitle","label":"Article Title"},{"value":"Fertility and Sterility","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/j.fertnstert.2015.01.024","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 2015 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.","name":"copyright","label":"Copyright"}]}}