{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,3]],"date-time":"2026-01-03T21:09:28Z","timestamp":1767474568776,"version":"3.28.0"},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2018,10,19]],"date-time":"2018-10-19T00:00:00Z","timestamp":1539907200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100007813","name":"Center for AIDS Research, University of Washington","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100007813","id-type":"DOI","asserted-by":"publisher"}]},{"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":["Intl J Gynecology &amp; Obste"],"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To quantify differences in assessing preterm delivery when calculating gestational age from last menstrual period (<jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content>) versus ultrasonography biometry.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The Zambian Preterm Birth Prevention Study is an ongoing prospective cohort study that commenced enrolment in August 2015 at Women and Newborn Hospital of University Teaching Hospital in Lusaka, Zambia. Women at less than 20\u00a0weeks of pregnancy who were enrolled between August 17, 2015, and August 31, 2017, and underwent ultrasonography examination were included in the present analysis. The primary outcome was the difference between ultrasonography\u2010 and <jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content>\u2010based estimated gestational age. Associations between baseline predictors and outcomes were assessed using simple regression. The proportion of preterm deliveries using <jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content>\u2010 and ultrasonography\u2010derived gestational dating was calculated using Kaplan\u2013Meier analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The analysis included 942 women. The discrepancy between estimating gestational age using ultrasonography and <jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content> increased with greater gestational age at presentation and among patients with no history of preterm delivery. In a Kaplan\u2010Meier analysis of 692 deliveries, 140 (20.2%, 95% confidence interval [<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>] 17.7\u201323.0) and 79 (11.4%, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 9.6\u201313.6) deliveries were classified as preterm by <jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content> and ultrasonography estimates, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Taking ultrasonography as a standard, a bias was observed in <jats:styled-content style=\"fixed-case\">LMP<\/jats:styled-content>\u2010based gestational age estimates, which increased with advancing gestation at presentation. This resulted in misclassification of term deliveries as preterm.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ijgo.12686","type":"journal-article","created":{"date-parts":[[2018,9,29]],"date-time":"2018-09-29T11:12:50Z","timestamp":1538219570000},"page":"9-15","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Quantifying bias between reported last menstrual period and ultrasonography estimates of gestational age in Lusaka, Zambia"],"prefix":"10.1002","volume":"144","author":[{"given":"Joan T.","family":"Price","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology University of North Carolina at Chapel Hill  Chapel Hill NC USA"},{"name":"Women and Newborn Hospital University Teaching Hospital  Lusaka Zambia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jennifer","family":"Winston","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology University of North Carolina at Chapel Hill  Chapel Hill NC USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bellington","family":"Vwalika","sequence":"additional","affiliation":[{"name":"Women and Newborn Hospital University Teaching Hospital  Lusaka Zambia"},{"name":"Department of Obstetrics and Gynecology University of Zambia School of Medicine  Lusaka Zambia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephen R.","family":"Cole","sequence":"additional","affiliation":[{"name":"Department of Epidemiology University of North Carolina at Chapel Hill  Chapel Hill NC USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marie C.D.","family":"Stoner","sequence":"additional","affiliation":[{"name":"Department of Epidemiology University of North Carolina at Chapel Hill  Chapel Hill NC USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mwansa K.","family":"Lubeya","sequence":"additional","affiliation":[{"name":"Women and Newborn Hospital University Teaching Hospital  Lusaka Zambia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrew","family":"Kumwenda","sequence":"additional","affiliation":[{"name":"Women and Newborn Hospital University Teaching Hospital  Lusaka Zambia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeffrey S.A.","family":"Stringer","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology University of North Carolina at Chapel Hill  Chapel Hill NC USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,10,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(12)60820-4"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-0035-1571199"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1097\/QAI.0000000000000847"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1093\/infdis\/jis553"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1093\/infdis\/jiv389"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/S2352-3018(16)30195-3"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1067\/mob.2002.127601"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/jp.2015.25"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000454932.15177.be"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.12688\/gatesopenres.12820.1"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.15894"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.13448"},{"volume-title":"Measuring Gestational Age in Vital Statistics Data: Transitioning to the Obstetric Estimate","year":"2015","author":"Martin JA","key":"e_1_2_8_14_1"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/ijgo.12036"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwm345"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2004.00311.x"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijgo.2010.11.013"},{"volume-title":"Zambia Demographic and Health Survey 2013\u20132014","year":"2014","author":"Central Statistical Office Ministry of Health Zambia and ICF International","key":"e_1_2_8_19_1"},{"volume-title":"Malawi Demographic and Health Survey 2015\u20102016","year":"2017","author":"National Statistical Office (NSO) and ICF Macro","key":"e_1_2_8_20_1"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1097\/EDE.0000000000000772"}],"container-title":["International Journal of Gynecology &amp; 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