Perinatal Risks Associated with Early Vanishing Twin Syndrome following Transfer of Cleavage- or Blastocyst-Stage Embryos

Table 2

Comparison of ovarian stimulation parameters of patients undergoing cleavage-stage ETs () or blastocyst-stage ETs () with early VT.

Parameter	Cleavage-stage ()	Blastocyst-stage ()
Total days of ovarian stimulation	9.77 (±1.49)	9.41 (±1.12)	0.06
Total dosage of gonadotropins (IU)	2992.7 (±329.1)	2527.2 (±278.3)	<0.001
Peak E2 level (pg/mL)	1609.2 (±471.9)	2259.0 (±512.3)	<0.001
Peak endometrial thickness (mm)	10.8 (±2.12)	10.7 (±1.92)	0.71
Total number of oocytes	12 (9–15)	14 (9–17)	<0.001
Total number of mature oocytes	10 (7–13)	12 (7–15)	<0.001

Data are presented as mean ± standard deviation, median (interquartile range), and (%); : estradiol.