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

Table 1

Baseline demographics of patients undergoing cleavage-stage ETs () or blastocyst-stage ETs () with early VT.

Parameter	Cleavage-stage ()	Blastocyst-stage ()
Age (years)	38.1 (±2.98)	36.2 (±1.01)	<0.001
Parity	0.71 (±0.21)	0.59 (±0.38)	0.11
BMI (kg/m^2)	23.1 (±2.97)	22.9 (±1.83)	0.55
Infertility diagnoses			0.28
Ovulatory	198 (27.9%)	15 (21.4%)
Tubal	38 (5.36%)	8 (11.4%)
Endometriosis	37 (5.22%)	7 (10%)
Male factor	262 (37.0%)	22 (31.4%)
Idiopathic	39 (5.50%)	9 (12.9%)
Other	135 (19.0%)	9 (12.9%)

Data are presented as mean ± standard deviation, median (interquartile range), and (%); BMI: body mass index.