Wang N, Lin K, Zhao X, Zhang P. The effect of an extended culture period on birth weight among singletons born after single or double vitrified embryo transfer.
Front Endocrinol (Lausanne) 2024;
15:1184966. [PMID:
38567304 PMCID:
PMC10985195 DOI:
10.3389/fendo.2024.1184966]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 03/07/2024] [Indexed: 04/04/2024] Open
Abstract
Aim
To evaluate the effect of an extended culture period on birth weight among singletons born after vitrified-warmed embryo transfer.
Methods
A retrospective cohort study was performed among 12400 women who gave birth to 1015, 1027, 687, and 9671 singletons after single blastocyst transfer, single cleavage-stage embryo transfer, double blastocyst transfer, and double cleavage-stage embryo transfer, respectively.
Results
The unadjusted birth weight of singletons born after vitrified blastocyst transfer were heavier than those born after cleavage-stage transfer (β=30.28, SE=13.17, P=0.022), as were the adjusted birth weights (β=0.09, SE=0.03, P=0.007). In addition, there was a 37% increased odd of having an infant with high birth weight after vitrified blastocyst transfer compared with vitrified cleavage stage transfer (OR=1.37, 95% CI:1.07-1.77).
Conclusion
The unadjusted and adjusted birth weight and odds of having an infant with high birth weight significantly increased after blastocyst transfer compared with cleavage-stage embryo transfer in vitrified-warmed cycles.
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