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Table 2 Embryology data: fresh embryo transfer

From: Should a single blastocyst transfer policy be a clinical decision or should it depend on the embryological evaluation on day 3?

  eSET with elective day 5 transfer eSET with transfer day 3 or 5 Statistical significance
Proportion IVF/ICSI as in vitro fertilization procedure (%)     
   IVF 44/341 (12.90) 24/247 (9.72) NS
   ICSI 297/341 (87.10) 223/247 (90.28) NS
Mean No. cumulus-oocyte complexes (SD) 12.33 (7.23) 11.66 (7.35) NS
Mean No. metaphase II oocytes 8.50 (6.26) 8.27 (6.46) NS
Mean No. two pronuclei oocytes 7.46 (5.03) 7.11 (4.95) NS
Embryos on day 3 2393 16901 -
Embryos on day 5 1619 8162  
Embryos transferred fresh 309 237 -
Embryo fresh transfer rate (%) 309/1619 (19.09) 237/13903 (17.05) NS
Subjects with fresh transfer 309 237 -
Subjects fresh transfer rate (%) 309/341 (90.62) 237/249 (95.18) <0.05
Embryos cryopreserved 640 5604 -
Embryo cryopreservation rate (%) 640/1619 (39.53) 5604/14651 (38.22) NS
Subjects with cryopreservation 191 1665 -
Subjects cryopreservation rate (%) 191/309 (61.81) 166/237 (70.04) 0.05
   Day 3 Day 5  
Proportion IVF/ICSI as in vitro fertilization procedure (%)     
   IVF   12/135 (8.89) 10/102 (9.80) NS
   ICSI   123/135 (91.11) 92/102 (90.20) NS
Mean No. cumulus-oocyte complexes (SD)   9.18 (5.92) 14.52 (6.25) <0.05
Mean No. metaphase II oocytes (SD)   6.00 (4.31) 11.01 (6.08) <0.05
Mean No. two pronuclei oocytes (SD)   4.73 (3.00) 10.05 (4.06) <0.05
Embryos on day 3   615 1000 -
Embryos on day 5   NA 775 -
Embryos transferred fresh   135 102 -
Embryo fresh transfer rate (%)   135/615 (21.95) 102/775 (13.16) <0.001
Embryos cryopreserved   154 363  
Embryo cryopreservation rate (%)   154/615 (25.04) 363/775 (46.84) <0.001
Subjects with cryopreservation   80 84 -
Subjects cryopreservation rate (%)   80/135 (59.26) 84/102 (82.35) <0.001
  1. 1 including 75 day 3 embryos from 6 subjects without fresh transfer.
  2. 2 including 41 day 5 embryos from 2 subjects without fresh transfer.
  3. 3 available day 3 embryos for subjects with fresh day 3 transfer and available day 5 embryos for subjects with fresh day 5 transfer.
  4. 4 including 43 embryo cryopreserved on day 3 and 5 in subjects without fresh transfer.
  5. 5 including 2 subjects with cryopreserved embryos without fresh transfer.