From: Effects of cumulus cell removal time during in vitro fertilization on embryo quality and pregnancy outcomes: a prospective randomized sibling-oocyte study
3 h group
20 h group
P
Live birth fetuses, (n)
48
31
Premature delivery fetus, (n)
21
8
Gender ratio,(male/female)
1.3
0.9
0.50
Birth weight(Kg), mean ± SD
2.8 ± 0.5
2.9 ± 0.4
0.20
Low birth weight rate, n(%)
16(33.3)
4(12.9)
0.04