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

Table 6

Very low birth weight and multiple logistic regression to account for confounding variables.

VLBW	Standard error	Adjusted OR; (95% CI)	P
Age (<35 versus ≥35 years)	0.47	1.04 (0.17–6.30)	0.97
Duration of ovarian stimulation (<9 versus ≥9 days)	0.54	0.96 (0.19–5.44)	0.75
Gonadotropin dose (<2000 versus ≥2000 IU)	0.41	0.71 (0.44–6.56)	0.44
Peak E2 level (<2000 versus ≥2000 pg/Ml)	0.19	0.81 (0.55–1.19)	0.29
Total number of oocytes (<10 versus ≥10)	0.26	0.98 (0.59–1.63)	0.94
Blastocyst-stage ET (yes versus no)	0.40	0.88 (0.36–2.17)	0.78

VLBW: very low birth weight; E₂: estradiol; ET: embryo transfer.