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Table 3 Embryo parameters analysed in the implanted (Group A) and non-implanted (Group B) advanced blastocysts

From: Developmental stage on day-5 and fragmentation rate on day-3 can influence the implantation potential of top-quality blastocysts in IVF cycles with single embryo transfer

  Group A n = 93 Group B n = 110 Statistics
Number of blastomeres on day 2    
    < 4 cells 2 (2.2%) 4 (3.6%) NS
    4 cells 80 (86.0%) 95 (86.4%)  
    > 4 cells 11 (11.8%) 11 (10.0%)  
Number of blastomeres on day 3    
    <8 cells 3 (3.2%) 7 (6.4%) NS
    8 cells 63 (67.7%) 67 (60.9%)  
    >8 cells 27 (29.0%) 36 (32.7%)  
Fragmentation rate on day 3    
    <10% 82 (88.2%) 84 (76.4%) 0.03
    ≥ 10–50% 11 (11.8%) 26 (23.6%)  
Embryo stage on day 4    
    Not compacted 3 (3.2%) 4 (3.6%) NS
    Compacted 68 (73.1%) 73 (66.4%)  
    Early blastocysts 22 (23.7%) 33 (30.0%)  
Cleavage pattern: 4 cells on day 2 vs. number of cells on day 3 n = 80 n = 95  
    4 cells – < 8 cells 3 (3.7%) 5 (5.2%) NS
    4 cells – 8 cells 58 (72.5%) 63 (66.3%)  
    4 cells – > 8 cells 19 (23.7%) 27 (28.4%)  
Cleavage pattern: 8 cells on day 3 vs. number of cells on day 2 n = 63 n = 67  
    8 cells – < 4 cells 2 (3.2%) 2 (3.0%) NS
    8 cells 4 58 (92.1%) 63 (94%)  
    8 cells – > 4 cells 3 (4.8%) 2 (3.0%)