. 2012 May 18;29(7):643–650. doi: 10.1007/s10815-012-9780-4

Table 1.

In vivo and in vitro developmental potentials of oocytes collected from the mice at young and old age

Group	In vivo development					In vitro development
Group	Individuals (n)	Pregnancies (n, % ± SE)	Total litter size (n)	Average litter size (n ± SE)^a	Stillbirth plus fetal malformations (n, % ± SE)^b	Individuals (n)	No. of oocytes	2-cell (% ± SE)	Blastocyst (% ± SE)
Old	15	8 (46.7 ± 6.7)^c	98	12.3 ± 0.5^c	17 (17.2 ± 0.9)^c	20	212	149 (69.9 ± 0.9)^c	72 (33.9 ± 0.3)^c
Young	15	15 (100 ± 0.0)^d	205	13.7 ± 0.4^c	6 (2.9 ± 0.8)^d	9	249	202 (80.9 ± 1.2)^d	126 (56.4 ± 1.9)^d

^aAverage litter size was compared only in the mice that had successfully given birth at both young and old age

^bStillbirth and fetal malformation rate is the percentage of total litter size

^c,dDifferent superscripts within same column indicate statistically significant difference (P < 0.05)