{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T11:51:31Z","timestamp":1788349891715,"version":"build-2803163510"},"reference-count":45,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2022,2,2]],"date-time":"2022-02-02T00:00:00Z","timestamp":1643760000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000050","name":"National Heart, Lung, and Blood Institute","doi-asserted-by":"publisher","award":["5T\u2010T32HL079891"],"award-info":[{"award-number":["5T\u2010T32HL079891"]}],"id":[{"id":"10.13039\/100000050","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Paediatric Perinatal Epid"],"published-print":{"date-parts":[[2022,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Chronic hypertension during pregnancy is associated with increased risk of adverse birth outcomes. In 2017, the American College of Cardiology and American Heart Association (ACC\/AHA) lowered thresholds to classify hypertension in non\u2010pregnant adults to SBP\u00a0\u2265\u00a0130\u00a0mmHg and DBP\u00a0\u2265\u00a080\u00a0mmHg (ie stage I hypertension), resulting in an additional 4.5\u2010million reproductive\u2010aged women meeting criteria for hypertension. Little is known about effects of pre\u2010pregnancy blood pressure (BP) in this range.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To examine the effect of pre\u2010pregnancy maternal BP on preterm delivery.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We analysed the data from two waves of the National Longitudinal Study of Adolescent to Adult Health, including participants that had measured BP at Wave IV (2008\u201309) and a pregnancy that resulted in a singleton live birth between Waves IV and V (2016\u201318; <jats:italic>n<\/jats:italic>\u00a0=\u00a02038). We categorised BP using ACC\/AHA cut\u2010offs: normal (SBP\u00a0&lt;\u00a0120\u00a0mmHg and DBP\u00a0&lt;\u00a080\u00a0mmHg), elevated (SBP 120\u2013129\u00a0mmHg and DBP\u00a0&lt;\u00a080\u00a0mmHg), hypertension stage I (SBP 130\u2013139\u00a0mmHg or DBP 80\u201389\u00a0mmHg) and hypertension stage II (SBP\u00a0\u2265\u00a0140\u00a0mmHg or DBP\u00a0\u2265\u00a090\u00a0mmHg). We estimated risk ratios (RR) with log\u2010binomial regression adjusting for maternal demographics, anthropometrics and medication use.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The prevalence of preterm delivery was 12.6%. A standard deviation (SD) increment in SBP (SD\u00a0=\u00a012.2\u00a0mmHg) and DBP (SD\u00a0=\u00a09.3\u00a0mmHg) was associated with a 14% (95% confidence interval [CI] 2, 27) and 20% (95% CI 4, 37) higher risk of preterm delivery. Compared to normotensive controls, stage I (RR 1.33, 95% CI 1.01, 1.74) and stage II (RR 1.34, 95% CI 0.89, 2.00) hypertension were associated with increased risk.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We observed greater risk of preterm delivery among women with higher pre\u2010pregnancy BP. Women with stage I hypertension during pregnancy may benefit from increased BP monitoring. Additional studies on the utility of foetal surveillance in this group are warranted.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ppe.12858","type":"journal-article","created":{"date-parts":[[2022,2,2]],"date-time":"2022-02-02T14:28:39Z","timestamp":1643812119000},"page":"370-379","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Chronic hypertension and risk of preterm delivery: National Longitudinal Study of Adolescents to Adult Health"],"prefix":"10.1111","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6490-2570","authenticated-orcid":false,"given":"Erin","family":"Delker","sequence":"first","affiliation":[{"name":"Joint Doctoral Program in Public Health University of California, San Diego (Department of Family Medicine and Public Health) and San Diego State University (Department of Public Health)  San Diego California USA"},{"name":"Department of Pediatrics University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2167-8921","authenticated-orcid":false,"given":"Gretchen","family":"Bandoli","sequence":"additional","affiliation":[{"name":"Department of Pediatrics University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yvette","family":"LaCoursiere","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen","family":"Ferran","sequence":"additional","affiliation":[{"name":"School of Public Health San Diego State University  San Diego California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linda","family":"Gallo","sequence":"additional","affiliation":[{"name":"Department of Psychology San Diego State University  San Diego California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eyal","family":"Oren","sequence":"additional","affiliation":[{"name":"School of Public Health San Diego State University  San Diego California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheila","family":"Gahagan","sequence":"additional","affiliation":[{"name":"Department of Pediatrics University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gladys A.","family":"Ramos","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Allison","sequence":"additional","affiliation":[{"name":"Department of Family Medicine UCSD  La Jolla California 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