Table 4 Blastocyst rate based on different variables.

From: Embryo morphokinetics derived from fresh and vitrified bovine oocytes predict blastocyst development and nuclear abnormalities

Variable

Outcome

N

Blastocyst rate

p value

Speed of cleavage

Slow

165

18.2 ± 3.0

< 0.0001

Fast

148

48.6 ± 4.1

Blastomere area

Even

192

40.4 ± 3.7

0.0002

Uneven

121

19.5 ± 3.7

Lag-phase

Yes

136

72.7 ± 3.8

< 0.0001

No

177

1.6 ± 0.09

Sort of cleavage

Multipolar

69

19.2 ± 5.0

0.01

Bipolar

244

35.6 ± 3.4

Ruffling membrane

Yes

49

12.2 ± 4.6

0.001

No

264

36.4 ± 2.9

  1. n = number of zygotes/embryos analyzed. Blastocyst rate based on presence or absence of responsive variables. The speed of first cleavage is considered fast before or at 32 h and 22 min. Blastomere area is considered even when the difference is equal to or lower than 23.4%. Multipolar cleavage is defined as direct zygotic division into three or more cells. Results are stated as least square means ± standard errors.
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