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Table 1 Clinical outcome of oocyte freezing and thawing in patients with no sperm or insufficient number of sperm on the day of in vitro fertilization

From: Slow oocyte freezing and thawing in couples with no sperm or an insufficient number of sperm on the day of in vitrofertilization

  Group 1
Frozen oocytes to be fertilized with autologous sperm of poor quality in severe azoospermia or oligoasthenoteratozoospermia
Group 2
Frozen oocytes to be fertilized with autologous or donated sperm of normal quality
TOTAL
OOCYTE FREEZING    
Patients 9 13 22
Mean female age (years) 31.3 (range 28-36) 31.9 (range 27-40) 31.7 (range 27 - 40)
Female indications of infertility 4 (44.4%) 10 (76.9%) 14
Freezing cycles 9 14 23
Frozen metaphase II oocytes 83 83 166
Mean number of frozen oocytes per patient 9.2 (min. 4-max. 14) 6.4 (min. 4-max. 12) 7.2 (min. 4 - max. 14)
OOCYTE THAWING    
Patients 9 13 22
Thawing cycles 10 13 23
Thawed metaphase II oocytes 83 83 166
Thawed metaphase II oocytes per cycle 8.3 (min. 4-max. 14) 6.4 (min. 4-max. 12) 7.2 (min. 4 - max. 14)
Thawed metaphase II oocytes per patient 9.2 (min. 4-max.14) 6.4 (min. 4-max. 12) 7.5 (min. 4 - max. 14)
Survived oocytes 56 (67.5%) 61 (73.5%) 117 (70.5%)
Fertilized oocytes after ICSI 38 (40.9%) 34 (55.7%) 72 (61.5%)
Embryos 23 34 57
Blastocysts 4 8 12
Blastocyst rate 17.4% 23.5% 21.0%
Embryo transfers (ET) 5 7 12
Double embryo transfers 4 7 11
Pregnancies 1 3 4
Clinical pregnancy rate per ET 20.0% 42.8% 33.3%
Clinical pregnancy rate per thawing cycle 11.1% 23.1% 17.4%
Birth of a child 1 3 4
  1. All differences between the two groups were not statistically significant.