Table 3.

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

	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%)