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Table 3 Comparison of clinical parameters between the oocyte retrieval difficulty group and the control group by IVF or ICSI

From: The impact of follicle-flushing during oocyte collection on embryo development of in-vitro fertilization

 Difficulty groupControlP Value
Insemination methods
IVF
 No. of cycles981180 
 Age---yr29 ± 3.0629 ± 3.060.99
 No. of retrieved oocytes9.49 ± 4.7012.08 ± 5.29P < 0.001
 2PN-fertilization rate655/930 (70.4%)10,584/14258 (74.2%)0.01
 Day3 good-quality embryo rate346/634 (54.6%)5740/10245 (56.0%)0.48
 Blastulation rate177/342 (51.8%)3269/5907 (55.3%)0.20
 Blastocyst utilization rate122/342 (35.7%)2297/5907 (38.9%)0.25
 Day5 blastocyst utilization rate86/342 (25.1%)1725/5907 (29.2%)0.11
 Day 6 blastocyst utilization rate36/256 (14.1%)572/4182 (13.7%)0.85
ICSI
 No. of cycles35401 
 Age---yr28.94 ± 3.4028.90 ± 3.200.93
 No. of retrieved oocytes7.94 ± 4.3512.25 ± 5.20P < 0.001
 No. of MII stage oocytes5.31 ± 4.348.25 ± 5.140.001
 2PN-fertilization rate145/186 (78%)2706/3307 (81.8%)0.19
 Day 3 good-quality embryo rate62/140 (44.3%)1531/2619 (58.5%)0.001
 Blastulation rate26/81 (32.1%)781/1757 (44.5%)0.03
 Blastocyst utilization rate13/81 (16.0%)541/1757 (30.8%)0.005
 Day 5 blastocyst utilization rate4/81 (4.9%)279/1757 (15.9%)0.004
 Day6 blastocyst utilization rate9/77 (11.7%)262/1216 (21.5%)0.043
  1. Note: Values are mean (±SD) unless otherwise indicated; IVF, in vitro fertilization; ICSI, intra-cytoplasmic sperm injection