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Abstract Objective: To explore the influencing factors of the outcome of the vitrification-thawed embryo transfer. Methods: A retrospect〖JP2〗ive analysis was conducted on the related data of 247 cases who underwent the vitrification-thawed embryo transfer. Patients were divided into pregnancy group (n=112) and non-pregnancy group (n=135). Nine possible influencing factors including age, cause of infertility, fertilization method, frozen-thawed embryo transfer cycles, embryo number transferred, embryo quality, endometrial thickness, endometrial preparation program, cryopreservation timing were analyzed. Results: The differences of the cryopreservation timing (χ2=8.703，P=0.003) and the endometrial thickness (χ2=2.838，P=0.009) between the pregnancy group and the non-pregnancy group were significant. Logistic regression analysis results showed that the cryopreservation timing and the endometrial thickness were related to pregnancy outcome. Conclusion: In vitrification-thawed embryo transfe〖JP〗r, the clinical pregnancy rate of D3 embryo is higher than D2 one, and within a certain range, the clinical pregnancy rates of women with more than 11.0 mm of the endometrial thickness are higher than those with not more than 11.0mm of the endometrial thickness.
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