Table 2.

Cryo-survival rate of vitrified oocytes from mice of different reproductive age (5 replicates)

Mouse age (weeks)	No. of oocytes vitrified	No. of oocytes survived	Survival rate (mean%±SD)	95% confidence interval (CI)
8–10	300	296	98.8 ± 2.1a	97.6∼100.1
16–20	220	217	98.0 ± 3.3a	95.8∼100.3
32–36	198	195	98.5 ± 2.2a	67.1∼100.2
44–48	144	133	90.4 ± 7.9b	83.1∼97.8

^a–bDifferent superscripts indicate significant difference (P < 0.05)