Clinical benefit of metaphase I oocytes

Table 2 Comparison of maturation rates, fertilization rates and embryo development between different time periods of IVM

Time interval of IVM	N° of MI oocytes	N° (%) of in vitro matured oocytes	N° (%) of fertilized oocytes	N° (%) of excellent + good quality embryos on Day 2^(c)	N° (%) of excellent + good quality embryos on Day 3
2 to 4 hrs	147	60 (41)	26 (43)^a	15 (58)	14 (61)
>4 to 7 hrs	136	57 (42)	31 (54)^a	15 (48)	9 (38)
>7 to 11 hrs	9	6 (67)	6 (100)^b	3 (50)	2 (40)
19 to 26 hrs	8	6 (75)	4 (67)^ab	1 (25)	2 (100)

^a,b Different letters indicate significant differences within columns (p < 0.05).
^c Thirteen embryos were transferred on day 2.

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