Clinical Study
Perinatal Risks Associated with Early Vanishing Twin Syndrome following Transfer of Cleavage- or Blastocyst-Stage Embryos
Table 4
Preterm birth and multiple logistic regression to account for confounding variables.
| PTB | Standard error | Adjusted OR (95% CI) | P |
| Age (<35 versus ≥35 years) | 0.21 | 0.87 (0.54–1.41) | 0.58 | Duration of ovarian stimulation (<9 versus ≥9 days) | 0.36 | 0.83 (0.35–1.97) | 0.67 | Gonadotropin dose (<2000 versus ≥2000 IU) | 0.86 | 0.93 (0.15–5.71) | 0.94 | Peak E2 level (<2000 versus ≥2000 pg/Ml) | 0.24 | 1.12 (0.74–1.71) | 0.57 | Total number of oocytes (<10 versus ≥10) | 0.13 | 0.70 (0.48–1.11) | 0.16 | Blastocyst-stage ET (yes versus no) | 0.21 | 0.74 (0.42–1.28) | 0.28 |
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PTB: preterm birth; : estradiol; ET: embryo transfer.
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