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Objective: To investigate the impact of natural cycles of freezing and thawing embryos implantation rate, clinical pregnancy rate and abortion rate of relevant factors. Methods: June 1, 2006 to May 31, 2008 at the Third Affiliated Hospital of Guangxi Medical University Reproductive Medical Center, in the natural ovulation cycle carried out under the 180 (156 cases) frozen embryo transfer cycles for the study, for data were analyzed retrospectively. Analysis of age, duration of infertility, insemination, ovulation day before endometrial thickness, serum E2 levels, number of embryos transferred, the number of transplants excellent factors on frozen embryo embryo implantation rate, clinical pregnancy, miscarriage rate. Application logistics regression analysis of clinical factors related to pregnancy. Results: 1.180 FET cycles of embryos 430, the average weekly period embryos 2.4 ± 0.6 个. There are 49 cases in which a clinical pregnancy, frozen embryo implantation rate was 14.45%, the clinical pregnancy rate was 27.22%, abortion rate was 12.24%. (2) the age factor: ≤ 30 age group, 31 to 35 age group and gt; 35 age group, frozen embryo implantation rate, clinical pregnancy and abortion rates among the three groups showed no significant difference (P gt; 0.05). 3 duration of infertility factors: lt; 5 years group, 5 to 9 years group and ≥ 10 years group, frozen embryo implantation rate, clinical pregnancy, miscarriage rate among the three groups showed no significant difference (P gt; 0.05 ) 4. insemination factors: ICSI group and the IVF group frozen embryo implantation rate, clinical pregnancy, miscarriage rate difference was not statistically significant (P gt; 0.05). 5 day before ovulation, endometrial thickness factors: Compare endometrium in lt; 8.0mm group, 8.1 ~ 11.0mm group, 11.1 ~ 14.0mm group, gt; 14mm groups. gt; 14mm group, with the first three groups were compared, 11.1 ~ 14mm group frozen embryo implantation rate was significantly higher than the previous two groups, the difference was statistically significant (P lt; 0.05); clinical pregnancy, miscarriage rate among the three groups the difference was not statistically significant (P gt; 0.05). 6 day before ovulation serum E2 level factors: ≤ 150 pg / ml group, 151 ~ 300 pg / ml group, 301 ~ 450 pg / ml group, and gt; 450 pg / ml group, frozen embryo implantation rate, clinical pregnancy rate and the abortion rate among the four groups showed no statistical significance (P gt; 0.05). 7 the number of embryos transferred factors: ET1 embryos without clinical pregnancy, frozen embryo implantation rate, clinical pregnancy, miscarriage rate ET2 and ET3 embryos embryos difference between groups was not statistically significant (P gt; 0.05). 8 number of factors, embryo transplants excellent: ET0 distinctions embryo group, ET1 distinctions embryo group, ET2 and ET3 group distinctions distinctions embryo embryo group, ET0 a gifted group of embryos frozen embryo implantation rate, clinical pregnancy rate was significantly lower in the latter three groups, the difference was statistically significant (P lt; 0.05); ET1 distinctions embryo group, ET2 and ET3 group distinctions embryos embryos three groups distinctions between groups thawed embryo implantation rate, clinical pregnancy rate was no difference statistically significant (P gt; 0.05); abortion rate among the four groups showed no statistically significant (P gt; 0.05). 9 clinical pregnancy related factors logistics regression analysis showed: ET embryo number, ET gifted embryo number was significantly associated with clinical pregnancy (regression coefficients were 0.77,0.50, OR was 2.16,1.65); age, duration of infertility, insemination, ovulation day before endometrial thickness, serum E2 levels and clinical pregnancy was no significant correlation (P gt; 0.05). Conclusions: 1. The quantity and quality of embryos frozen embryo transfer is affecting important factors for success. (2) the day before ovulation, endometrial thickness at 11.1 ~ 14mm, obtain higher thawed embryo implantation rate. 3 age, duration of infertility, fertilization method and serum E2 levels on the day before ovulation frozen embryo transfer success had no effect.
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