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Table 4 Clinical outcome after vitrified blastocyst and cleavage-stage transfer (age <35 years)

From: Clinical outcome of fresh and vitrified-warmed blastocyst and cleavage-stage embryo transfers in ethnic Chinese ART patients

  Cleavage-stage transfer Blastocyst Transfer
  Fresh group Vitrified group C Fresh group Vitrified group
No. of patients 274 36 168 118
No. of embryos transferred (mean± SD) 2.15±0.55 2.19±0.40 1.82±0.38 1.69±0.58a
Clinical pregnancy rate, no. (%) 129/274 (47.8) 18/36 (50.0) 69/168 (41.7) 67/118 (56.8)b
Implantation rate, no. (%) 184/589 (31.2) 27/79 (34.2) 97/305 (31.8) 94/200 (47.0)b
Mutiple pregnancy rate, no. (%) 53/129 (41.1) 9/18 (50.0) 28/69 (40.6) 26/67 (37.3)
Singleton pregnancy rate, no. 76 9 41 41
Twin pregnancy rate, no. 51 9 27 25
Triplets pregnancy rate, no. 2 0 1 1
  1. Note:values are presented as number, number (%) or mean ± SD.
  2. a:significant difference between cleavage-stage transfer and blastocyst transfer in vitrified group (p<0.01).
  3. b:significant difference between fresh group and vitrified group in blastocyst transfer (p<0.05).
  4. C: patients without transfer in fresh cycles.