Participants follow up after pregnancy confirmed
post-ET
MISCARRIAGE
Serum beta hCG was evaluated 14 days after embryo transfer. Biochemical pregnancy was defined as the elevation of serum hCG (> 25 µg/dL). If pregnancy was confirmed, transvaginal sonography was performed to identify a gestational sac. Transvaginal sonography was then performed every two weeks until the 12th week of gestation. All patients received routine antenatal care until delivery. Clinical pregnancy was the visualization of an intrauterine gestational sac by transvaginal ultrasound at 3–4 weeks post-ET. The implantation rate was the number of gestational sacs observed divided by the number of embryos transferredThe pregnancy outcomes were defined as followings:Biochemical pregnancy rate = the number of patients with hCG > 25 IU/mL/the number of patients who received embryo transfer.Clinical pregnancy rate = the number of patients with visible gestational sac/the number of patients who received embryo transfer.Ongoing pregnancy rate = the number of patients with viable pregnancy at 12 weeks gestation/the number of patients who received embryo transfer.Miscarriage rate = the number of patients with miscarriage/ the number of patients who received embryo transfer.Live birth rate = the number of patients with live birth / the number of patients who received embryo transfer.