{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T07:49:25Z","timestamp":1698738565762},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2012,12,5]],"date-time":"2012-12-05T00:00:00Z","timestamp":1354665600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Paediatric Perinatal Epid"],"published-print":{"date-parts":[[2013,1]]},"abstract":"Abstract<\/jats:title>Background<\/jats:title>We propose a methodology for identifying and analysing \u2018elective\u2019 preterm births (PTBs<\/jats:styled-content>) using administrative data, and apply this methodology to C<\/jats:styled-content>alifornia data with the objective of providing a framework to further explore the potential rationales for early delivery.<\/jats:p><\/jats:sec>Methods<\/jats:title>Using the C<\/jats:styled-content>alifornia linked birth cohorts for 1999, 2002 and 2005, singleton PTBs<\/jats:styled-content> were identified using birth certificate gestational age\u2009\u2265\u200924 and <37 weeks. Through a hierarchical scheme that first removed cases with standard or \u2018hard\u2019 indications for early delivery (e.g. severe preeclampsia, placenta previa), cases of \u2018elective\u2019 PTB<\/jats:styled-content> were identified with coding for medical intervention, that is, elective caesarean or labour induction. We calculated rates of elective PTB<\/jats:styled-content>, with subanalyses of early (<34 weeks of gestational age) and late PTB<\/jats:styled-content> (34 to <37 weeks of gestational age) using hierarchical logistic regression models.<\/jats:p><\/jats:sec>Results<\/jats:title>Of 1\u2009387\u2009565 singleton deliveries, 99\u2009614 (7.2%) were preterm. Elective PTBs<\/jats:styled-content> increased 27.7% over the 6\u2010year study period, with nearly all cases confined to the late PTB<\/jats:styled-content> stratum; elective late PTB<\/jats:styled-content> rates rose from 10.5% to 13.5% of all late PTBs<\/jats:styled-content> (P<\/jats:italic>\u2009<\u20090.0001). Indications for delivery in this Elective Group (\u2018soft indications\u2019) included prior pelvic floor repair, mental health conditions, fetal anomalies, malpresentation and oligohydramnios. Six per cent of patients with a late PTB<\/jats:styled-content> had a medical intervention with no hard or soft indication for delivery.<\/jats:p><\/jats:sec>Conclusions<\/jats:title>Using administrative data, we developed a method for identifying and trending the proportion of PTBs<\/jats:styled-content> that is \u2018elective\u2019. This method can be used to explore and monitor potential strategies for the prevention of elective PTB<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ppe.12018","type":"journal-article","created":{"date-parts":[[2012,12,6]],"date-time":"2012-12-06T02:50:37Z","timestamp":1354762237000},"page":"44-53","source":"Crossref","is-referenced-by-count":1,"title":["Trending Elective Preterm Deliveries Using Administrative Data"],"prefix":"10.1111","volume":"27","author":[{"given":"Lisa M.","family":"Korst","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Keck School of Medicine University of Southern California Los Angeles CA"},{"name":"Childbirth Research Associates North Hollywood CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Moshe","family":"Fridman","sequence":"additional","affiliation":[{"name":"AMF Consulting Los Angeles CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael C.","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, David Geffen School of Medicine UCLA Los Angeles CA"},{"name":"Department of Community Health Sciences, School of Public Health UCLA Los Angeles CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Fleege","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Burns Allen Research Institute Cedars\u2010Sinai Medical Center Los Angeles CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Connie","family":"Mitchell","sequence":"additional","affiliation":[{"name":"Maternal, Child and Adolescent Health Division California Department of Public Health Sacramento CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kimberly D.","family":"Gregory","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, David Geffen School of Medicine UCLA Los Angeles CA"},{"name":"Department of Community Health Sciences, School of Public Health UCLA Los Angeles CA"},{"name":"Department of Obstetrics and Gynecology, Burns Allen Research Institute Cedars\u2010Sinai Medical Center Los Angeles CA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2012,12,5]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMra0904308"},{"key":"e_1_2_6_3_1","first-page":"1","article-title":"Born a bit too early: recent trends in late preterm births","volume":"24","author":"Martin JA","year":"2009","journal-title":"NCHS Data Brief"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2006-0018"},{"key":"e_1_2_6_5_1","first-page":"1","article-title":"Are preterm births on the decline in the United States? Recent data from the National Vital Statistics System","volume":"29","author":"Martin JA","year":"2010","journal-title":"NCHS Data Brief"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000158124.96300.c7"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.semperi.2006.01.009"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2009.06.066"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3181f73f97"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0029-7844(03)00617-3"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2006-3629"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pcl.2009.03.009"},{"key":"e_1_2_6_13_1","volume-title":"Guide to Completing the Facility Worksheets for the Certificate of Live Birth and Report of Fetal Death. 2003 Revision","author":"US Department of Health and Human Services","year":"2003"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwp468"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2009-0913"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2006.05.021"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3016.2003.00540.x"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.7863\/jum.2011.30.11.1573"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3182255999"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.semperi.2009.02.002"},{"key":"e_1_2_6_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2005.08.058"}],"container-title":["Paediatric and Perinatal Epidemiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fppe.12018","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/ppe.12018","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T15:02:06Z","timestamp":1698678126000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/ppe.12018"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,12,5]]},"references-count":20,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2013,1]]}},"alternative-id":["10.1111\/ppe.12018"],"URL":"https:\/\/doi.org\/10.1111\/ppe.12018","archive":["Portico"],"relation":{},"ISSN":["0269-5022","1365-3016"],"issn-type":[{"value":"0269-5022","type":"print"},{"value":"1365-3016","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,12,5]]}}}