* The results are presented as mean (95% CI) or proportion. The significance level was considered to be 5%, so that a p value<0.05 is considered significant. The chi-square statistical test was performed for categorical variables and T Student (ANOVA) for continuous variables (implantation rate).
†- Clinical gestation rate (%): Proportion of pregnancies in relation to the total number of transfer cycles, determined by the presence of at least one embryo with positive cardiac activity on ultrasound at 5-6 weeks after oocyte retrieval. Implantation rate (%): Ratio between the number of gestational sacs visible sonographically and the number of embryos transferred. Ongoing pregnancy rate (%): Proportion of clinical gestations that do not end in clinical abortion or ectopic pregnancy. Miscarriage rate (%): Number of gestational losses in relation to total pregnancies. LBR (%): Proportion of live newborns in relation to cycles performed.