Table 1.

Comparison of fertilization and embryonic development between in vitro and in vivo matured sibling oocytes

	In vitro matured MI oocytes	In vivo matured sibling oocytes (control)
Total N° of oocytes injected	129	339
N° (%) of normal fertilized oocytesa	67 (52)*	229 (68)
Embryo development on day 2 (%)b
Excellent	24*	41
Good	27	32
Poor	49*	27
Embryo development on day 3 (%)b
Excellent	22*	38
Good	28	32
Poor	50*	30

* Statistically different between columns (p < 0.05).

^a Normal fertilized oocytes were defined as oocytes containing 2 pronuclei en 2 polar bodies.

^b The proportions of excellent, good and poor embryos are expressed per total number of embryos obtained on day 2 or day 3.