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Table 2 Comparison of clinical parameters between the oocyte retrieval difficulty group and the control group

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

 Difficulty groupControlP Value
No. of cycles1331581 
Total gonadotrophins dose1748.39 ± 654.121821.57 ± 785.230.79
E2 (pg/ml) in hCG Day3444.23 ± 2224.303451.94 ± 1663.190.99
Progesterone(ng/ml) in hCG Day0.95 ± 0.790.89 ± 0.550.59
Duration of COH10.66 ± 3.149.98 ± 2.470.149
No. of follicles aspirated12.17 ± 4.9212.46 ± 4.53 
No. of recovered oocytes9.08 ± 4.6512.13 ± 5.27P < 0.001
2PN-fertilization rate800/1116 (71.7%)13,290/17565 (75.7%)0.003
Cleavage rate774/800 (96.8%)12,864/13290 (96.8%)0.93
Day 3 good-quality embryo rate408/774 (52.7%)7271/12864 (56.5%)0.04
Blastulation rate203/423 (48.0%)4050/7664 (52.8%)0.06
Blastocyst utilization rate135/423 (31.9%)2838/7664 (37.0%)0.03
Day 5 blastocyst utilization rate90/423 (21.3%)2004/7664 (26.1%)0.02
Day 6 blastocyst utilization rate45/333 (13.5%)834/5660 (14.7%)0.58
  1. Note: Values are mean (±SD) unless otherwise indicated