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Only the first frozen embryo transfer was included for women who had repeated transfers during the period. Archived serum samples taken at LH surge or before the start of progestogens for FET were analysed for 25(OH)D levels using mass spectrometry. The main outcome measure was the live birth rate. Vitamin D deficiency was defined as serum 25(OH)D\u2009&lt;\u200950\u00a0nmol\/l (&lt;\u200920\u00a0ng\/ml) based on the Endocrine Society Clinical Practice guidelines.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The median age was 36 (25th\u201375th percentile 34\u201338) years. 37.7% (561\/1489) women had cleavage stage embryo transfer and 62.3% (928\/1489) women had blastocyst transfer. When analysing the results based on the threshold in the Endocrine Society guideline of 50 nmol\/l (20 ng\/ml) for vitamin D deficiency, there were no statistically significant differences in the live birth rate in the vitamin D deficient and non-deficient groups [151\/489 (30.9%) vs 341\/998 (34.2%), OR 0.861, 95% CI 0.683\u20131.086 <jats:italic>P<\/jats:italic>\u2009=\u20090.205]. There were no statistically significant differences in the pregnancy rates, ongoing pregnancy rates, and miscarriage rates between the two groups.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>Serum vitamin D is not associated with birth rate in women undergoing FET.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s10815-024-03326-z","type":"journal-article","created":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T12:55:01Z","timestamp":1736427301000},"page":"509-523","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Association of serum vitamin D level and live birth rate in women undergoing frozen embryo transfer\u2014a retrospective cohort study"],"prefix":"10.1007","volume":"42","author":[{"given":"Jennifer K.Y.","family":"Ko","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mei Ting","family":"Lam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin K.W.","family":"Lam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tat On","family":"Chan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raymond H.W.","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ernest H.Y.","family":"Ng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,1,9]]},"reference":[{"issue":"4","key":"3326_CR1","doi-asserted-by":"publisher","first-page":"845","DOI":"10.1016\/j.ecl.2017.07.002","volume":"46","author":"N van Schoor","year":"2017","unstructured":"van Schoor N, Lips P. 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