{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T16:50:04Z","timestamp":1791651004923,"version":"4.3.4"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T00:00:00Z","timestamp":1791590400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T00:00:00Z","timestamp":1791590400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gynecol Obstet Invest"],"abstract":"<jats:p>Objective: To evaluate if the prevalence of preterm birth (PTB) diminishes as the cervix becomes longer than 25 mm. Design: Retrospective cohort Participants\/Materials, Setting, Methods: Transvaginal cervical length (CL) was measured in 3,376 singleton pregnancies without fetal anomalies between 17 and 24 weeks of gestation. Patients were classified as low-risk (LR, n=2,863; 84.8%) or high-risk (HR, n=513; 15.2%) based on previous history of PTB. CL measurements were stratified into the following groups: \u226415 mm, 15.1\u201325.0 mm, and thereafter in 5 mm increments up to 55 mm. Spontaneous PTB was defined as delivery &lt;37 weeks and \u226434 weeks, not attributed to maternal or fetal indications (e.g., preeclampsia, fetal growth restriction). Prevalence of PTB was analyzed across CL categories and between risk groups. Results: The overall prevalence of PTB &lt;37 weeks was 21.7% (733\/3,376), and of PTB \u226434 weeks was 5.5% (n=188\/3,376). In LR patients, the prevalence of PTB &lt;37 weeks was higher at CL \u226425 mm, and did not change when the cervix was &gt;25 mm. In LR patients, the prevalence of PTB \u226434 weeks was higher at 25.1-30.0 mm, as compared to patients with CL &gt;30 mm. Thereafter, the prevalence of PTB \u226434 weeks did not change. In HR pregnancies, the prevalence of PTB &lt;37 weeks did not change at CL &gt;15 mm, and of PTB \u226434 weeks at CL &gt;25 mm. Limitations: Small variations among operators may affect cervical length measurements. Patients with a short cervix were offered vaginal progesterone, which could affect the frequency of PTB. Conclusion: In LR pregnant women, the prevalence of PTB \u226434 weeks was higher at CL 25-30 mm than at CL&gt;30 mm. HR patients had a significantly higher prevalence of PTB at any CL than LR patients.<\/jats:p>","DOI":"10.1159\/goi\/aczag016","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T11:52:27Z","timestamp":1791546747000},"source":"Crossref","is-referenced-by-count":0,"title":["Does the rate of preterm birth change when cervical length isgreater than 25 mm?"],"prefix":"10.1159","author":[{"given":"Edgar","family":"Hernandez-Andrede","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donatella","family":"Gerulewicz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zulema","family":"Alcantar Paniagua","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eleazar E","family":"Soto Torres","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sean C.","family":"Blackwell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"127","published-online":{"date-parts":[[2026,10,10]]},"container-title":["Gynecologic and Obstetric Investigation"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/goi\/aczag016","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T16:01:57Z","timestamp":1791648117000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/goi\/aczag016"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,10,10]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/goi\/aczag016","archive":["Portico"],"relation":{},"ISSN":["0378-7346","1423-002X"],"issn-type":[{"value":"0378-7346","type":"print"},{"value":"1423-002X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,10,10]]}}}