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Table 3 Clinical outcome after fresh blastocyst and cleavage-stage transfer

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

  Female age < 35 years 35 years ≤Female age≤39 years
  Cleavage-stage transfer group Blastocyst transfer group Cleavage-stage transfer group Blastocyst transfer group
No. of patients 274 168 52 21
Retrieved oocytes (mean± SD) 7.33±3.57 11.43±4.01a 6.23±3.68 11.24±4.55a
No. of embryos transferred (mean± SD) 2.15±0.55 1.75±0.34a 2.67±0.76 1.76±0.83a
Clinical pregnancy rate, no. (%) 129/274(47.1) 69/168(41.1) 22/52(42.3) 7/21(33.3)
Implantation rate, no. (%) 184/589(31.2) 97/305(31.8) 30/139(21.6) 8/37(21.6)
Multiple pregnancy rate, no. (%) 53/129(41.1) 28/69(40.6) 7/22(31.8) 1/7(14.3)
Singleton pregnancy rate, no. 76 41 15 6
Twin pregnancy rate, no. 51 27 6 1
Triplets pregnancy rate, no. 2 1 1 0
  1. Note : Values are presented as number, number (%) or mean ± SD.
  2. a:significant difference between cleavage stage and blastocyst transfer in two different age groups (p<0.05).
  3. Clinical pregnancy, implantation, and multiple pregnancy rates all show no significant difference between cleavage stage and blastocyst transfer in two different age groups.