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Table 2 Development potential of oocytes and embryos after 4 weeks of CUMS

From: HSP70 overexpression may play a protective role in the mouse embryos stimulated by CUMS

  Control group Mild stress group Moderate stress group Severe stress group P value
No. of mice 20 20 20 20  
No. of oocytesa 32 ± 7 29 ± 5 22 ± 6* 15 ± 5* <0.05
Fertilization rateb 87 % 78 % 61 %* 40 %* <0.05
No. of 2-cell embryosa 27 ± 5 22 ± 4 15 ± 5* 9 ± 2* <0.05
No. of D4 embryosa 24 ± 4 18 ± 3 10 ± 4* 4 ± 2* <0.05
No. of high quality embryosa 20 ± 5 13 ± 4 5 ± 2* 1 ± 1* <0.05
High quality embryo rateb 83 % 72 % 50 %* 25 %* <0.05
No. of blastocystsa 8 ± 3 5 ± 2 2 ± 1* 1 ± 1* <0.05
Blastocyst information rateb 33 % 28 % 20 % 25 % NS
  1. aData are shown as the mean ± SD and were analyzed by ANOVA and LSD testing
  2. bData are shown as rates and were analyzed by χ 2 test and the partitioning χ 2 method
  3. *P < 0.05 compared with the control group, measured by LSD test or the partitioning χ 2 method. NS not significant