Clinical Study
Perinatal Risks Associated with Early Vanishing Twin Syndrome following Transfer of Cleavage- or Blastocyst-Stage Embryos
Table 7
Term low birth weight and multiple logistic regression to account for confounding variables.
| Term LBW | Standard error | Adjusted OR (95% CI) | P |
| Age (<35 versus ≥35 years) | 0.46 | 0.86 (0.59–7.80) | 0.76 | Duration of ovarian stimulation (<9 versus ≥9 days) | 0.73 | 0.92 (0.35–3.08) | 0.33 | Gonadotropin dose (<2000 versus ≥2000 IU) | 0.42 | 0.83 (0.44–6.09) | 0.38 | Peak E2 level (<2000 versus ≥2000 pg/Ml) | 0.32 | 0.92 (0.16–1.86) | 0.48 | Total number of oocytes (<10 versus ≥10) | 0.39 | 0.94 (0.09–1.82) | 0.25 | Blastocyst-stage ET (yes versus no) | 0.47 | 0.91 (0.28–3.83) | 0.84 |
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LBW: low birth weight; E2: estradiol; ET: embryo transfer.
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