{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T11:44:37Z","timestamp":1778154277017,"version":"3.51.4"},"reference-count":13,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2013,7]]},"DOI":"10.1097\/aog.0b013e3182972907","type":"journal-article","created":{"date-parts":[[2013,6,6]],"date-time":"2013-06-06T11:34:37Z","timestamp":1370518477000},"page":"27-32","source":"Crossref","is-referenced-by-count":18,"title":["Relationship of the Length of the First Stage of Labor to the Length of the Second Stage"],"prefix":"10.1097","volume":"122","author":[{"given":"David B.","family":"Nelson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Donald D.","family":"McIntire","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenneth J.","family":"Leveno","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","reference":[{"key":"R3-5-20210328","doi-asserted-by":"crossref","first-page":"822","DOI":"10.1016\/S0002-9378(78)80017-9","article-title":"Classic pages in Obstetrics and Gynecology. The graphic analysis of labor.","volume":"132","author":"Friedman","year":"1978","journal-title":"Am J Obstet Gynecol"},{"key":"R4-5-20210328","doi-asserted-by":"crossref","first-page":"567","DOI":"10.1097\/00006250-195512000-00001","article-title":"Primigravid labor: a graphicostatistical analysis.","volume":"6","author":"Friedman","year":"1955","journal-title":"Obstet Gynecol"},{"key":"R5-5-20210328","first-page":"842","article-title":"An objective approach to the diagnosis and management of abnormal labor.","volume":"48","author":"Friedman","year":"1972","journal-title":"Bull N Y Acad Med"},{"key":"R7-5-20210328","doi-asserted-by":"crossref","first-page":"824","DOI":"10.1067\/mob.2002.127142","article-title":"Reassessing the labor curve in nulliparous women.","volume":"187","author":"Zhang","year":"2002","journal-title":"Am J Obstet Gynecol"},{"key":"R8-5-20210328","doi-asserted-by":"crossref","first-page":"1281","DOI":"10.1097\/AOG.0b013e3181fdef6e","article-title":". Consortium on safe labor. Contemporary patterns of spontaneous labor with normal neonatal outcomes.","volume":"116","author":"Zhang","year":"2010","journal-title":"Obstet Gynecol"},{"key":"R9-5-20210328","doi-asserted-by":"crossref","first-page":"1223","DOI":"10.1016\/S0002-9378(16)38916-5","article-title":"The duration of the second stage of labor.","volume":"63","author":"Hellman","year":"1952","journal-title":"Am J Obstet Gynecol"},{"key":"R10-5-20210328","first-page":"111","article-title":"High- versus low-dose oxytocin for labor stimulation.","volume":"80","author":"Satin","year":"1992","journal-title":"Obstet Gynecol"},{"key":"R11-5-20210328","doi-asserted-by":"crossref","first-page":"812","DOI":"10.1097\/AOG.0b013e31819c82cc","article-title":"The prognosis for spontaneous labor in women with uncomplicated term pregnancies: implications for cesarean delivery on maternal request.","volume":"113","author":"Worley","year":"2009","journal-title":"Obstet Gynecol"},{"key":"R12-5-20210328","doi-asserted-by":"crossref","first-page":"1181","DOI":"10.1097\/AOG.0b013e3182704880","article-title":"Preventing the first cesarean delivery: summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, and American College of Obstetricians and Gynecologists Workshop.","volume":"120","author":"Spong","year":"2012","journal-title":"Obstet Gynecol"},{"key":"R13-5-20210328","doi-asserted-by":"crossref","first-page":"717","DOI":"10.1055\/s-0032-1314894","article-title":"An analysis of second-stage labor beyond 3 hours in nulliparous women.","volume":"29","author":"Bleich","year":"2012","journal-title":"Am J Perinatol"},{"key":"R14-5-20210328","first-page":"1445","article-title":"ACOG Practice Bulletin No. 49. American College of Obstetricians and Gynecologists.","volume":"102","year":"2003","journal-title":"Obstet Gynecol"},{"key":"R15-5-20210328","first-page":"933","article-title":"How long is too long: does a prolonged second stage of labor in nulliparous women affect maternal and neonatal outcomes Am J Obstet G","volume":"191","author":"Cheng","year":"2004","journal-title":"ynecol"},{"key":"R16-5-20210328","doi-asserted-by":"crossref","first-page":"1248","DOI":"10.1097\/AOG.0b013e3181a722d6","article-title":"Maternal and perinatal outcomes with increasing duration of the second stage of labor.","volume":"113","author":"Allen","year":"2009","journal-title":"Obstet Gynecol"}],"container-title":["Obstetrics &amp; Gynecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.lww.com\/10.1097\/AOG.0b013e3182972907","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,5,13]],"date-time":"2021-05-13T22:54:50Z","timestamp":1620946490000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.lww.com\/00006250-201307000-00005"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,7]]},"references-count":13,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2013]]}},"URL":"https:\/\/doi.org\/10.1097\/aog.0b013e3182972907","relation":{},"ISSN":["0029-7844"],"issn-type":[{"value":"0029-7844","type":"print"}],"subject":[],"published":{"date-parts":[[2013,7]]}}}