{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T23:12:47Z","timestamp":1788304367688,"version":"build-2803163510"},"reference-count":33,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2016,10,29]],"date-time":"2016-10-29T00:00:00Z","timestamp":1477699200000},"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":[[2017,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Epidemiologic studies examining preconception risk factors on perinatal outcomes are typically restricted to livebirths. By including only non\u2010terminated pregnancies, estimates for the underlying pregnancy cohort may be subject to selection bias. We examined if potential selection bias due to induced termination by maternal race may result in different estimates of the non\u2010Hispanic black \u2013 non\u2010Hispanic white risk ratio (<jats:styled-content style=\"fixed-case\">RR<\/jats:styled-content>) for preterm delivery (<jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content>) among a reconstructed pregnancy cohort (\u2018pseudo\u2010pregnancy cohort\u2019).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Using New York City registries of 1.6 million livebirths, spontaneous terminations, and induced terminations among non\u2010Hispanic black and non\u2010Hispanic white women (2000\u201312), we multiply imputed <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> (&lt;37 weeks) and early <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> (&lt;32 weeks) outcomes for induced terminations based on maternal race, age, parity, marital status, nativity, and medical care payer to construct the pseudo\u2010pregnancy cohort.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among non\u2010Hispanic black and non\u2010Hispanic white women, 55% and 19% of pregnancies ended in induced termination and 13% and 8% resulted in <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content>, respectively. Although several factors were associated with both <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> and induced termination, <jats:styled-content style=\"fixed-case\">PTD RR<\/jats:styled-content>s in the birth (<jats:styled-content style=\"fixed-case\">RR<\/jats:styled-content> 1.64, 95% confidence interval (<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>) 1.62, 1.66) and pseudo\u2010pregnancy (<jats:styled-content style=\"fixed-case\">RR<\/jats:styled-content> 1.63, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.56, 1.71) cohorts were similar. However, early <jats:styled-content style=\"fixed-case\">PTD RR<\/jats:styled-content> was somewhat larger in the birth (<jats:styled-content style=\"fixed-case\">RR<\/jats:styled-content> 2.80, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 2.71, 2.89) than pseudo\u2010pregnancy (<jats:styled-content style=\"fixed-case\">RR<\/jats:styled-content> 2.47, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 2.23, 2.73) cohort.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Using birth certificate data \u2013 thereby excluding induced terminations \u2013 to estimate the <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> racial disparity did not produce biased estimates. Our data suggest observed <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> disparities likely are not artefacts of selection bias due to induced termination.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ppe.12322","type":"journal-article","created":{"date-parts":[[2016,10,29]],"date-time":"2016-10-29T07:46:47Z","timestamp":1477727207000},"page":"55-63","source":"Crossref","is-referenced-by-count":5,"title":["Reconstructing a Pregnancy Cohort to Examine Potential Selection Bias in Studies on Racial Disparities in Preterm Delivery"],"prefix":"10.1111","volume":"31","author":[{"given":"Katherine J.","family":"Sapra","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Weill Cornell Medical College New York NY"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashok K.","family":"Chaurasia","sequence":"additional","affiliation":[{"name":"School of Public Health and Health Systems University of Waterloo Waterloo ON Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer A.","family":"Hutcheon","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology University of British Columbia Vancouver BC Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katherine A.","family":"Ahrens","sequence":"additional","affiliation":[{"name":"Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Rockville MD"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,10,29]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"501","volume-title":"Prematurity at Birth: Determinants, Consequences and Geographic Variation","author":"Alexander G","year":"2006"},{"key":"e_1_2_7_3_1","unstructured":"American Public Health Association.Reducing Racial\/Ethnic and Socioeconomic Disparities in Preterm and Low Birthweight Births (Policy No. 20062).2006;http:\/\/www.apha.org\/policies-and-advocacy\/public-health-policy-statements\/policy-database\/2014\/07\/18\/10\/01\/reducing-racial-ethnic-and-socioeconomic-disparities-in-preterm-and-low-birthweight-births[last accessed July 29 2015]."},{"key":"e_1_2_7_4_1","volume-title":"Preterm Birth: Causes, Consequences, and Prevention","author":"Butler AS","year":"2007"},{"key":"e_1_2_7_5_1","unstructured":"March of Dimes.March of Dimes 2014 Premature Birth Report Card.2014;http:\/\/www.marchofdimes.org\/materials\/premature-birth-report-card-united-states.pdf. 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