Table 4.
Time lapse imaging results: Comparison of cell development duration between normal and abnormal embryos
| Stage | Normal embryos (n = 197) Mean duration (hours) (Mean ± SD) | Abnormal embryos (n = 263) Mean duration (Mean ± SD) | P value |
|---|---|---|---|
| tPB2 | 4.0 ± 2.2 | 4.5 ± 1.8 | p > 0.05 |
| tPNa | 10.6 ± 3.4 | 10.8 ± 3.2 | p > 0.05 |
| tPNf | 24.5 ± 4.3 | 25.8 ± 5.6 | P < 0.05* |
| t2 | 28.3 ± 7.2 | 30.6 ± 9.7 | P < 0.05* |
| t3 | 38.7 ± 7.0 | 39.7 ± 8.5 | p > 0.05 |
| t4 | 40.5 ± 7.2 | 41.5 ± 8.2 | p > 0.05 |
| t5 | 52.3 ± 8.6 | 50.1 ± 9.6 | P < 0.05* |
| CC2 | 10.5 ± 4.2 | 9.1 ± 4.9 | P < 0.05* |
| CC3 | 13.5 ± 5.6 | 10.8 ± 7.0 | P < 0.05* |
| S2 | 1.8 ± 3.3 | 2.1 ± 4.0 | p > 0.05 |
| t5-t2 diff: | 23.9 ± 7.4 | 20.1 ± 8.6 | P < 0.05* |
*Statistically significant
tPB2: Apperance of second polar body
tPNa: Appearance of pronuclei
tPNf : Both pronuclei faded
t2: Divison to 2 cells
t3: Divison to 3 cells
t4: Divison to 4 cells
t5: Divison to 5 cells
CC2: Duration of second cell cycle - from 2 to 3 cells
CC3: duration of the third cell cycle CC3 (t5-t3)
S2: Second synchrony
t5-t2 diff: Difference between t5 and t2