Table 4.

Comparison of mean cell number and inner cell mass -to- trophectoderm ratio (ICM/TE) in blastocysts produced by different culture systems*

Culture system	No. of blastocysts examined	Cell number (mean ± SD)
		Total	TE	ICM	ICM / TE (%)
Non-WOW
with group culture	30	61.8 ± 12.3a	48.6 ± 11.9a	13.2 ± 1.7a	28.8 ± 8.5a
Non-WOW
with single culture	30	48.4 ± 12.0b	36.9 ± 11.3b	11.5 ± 1.4b	33.9 ± 10.1ab
WOW
with group culture	30	66.7 ± 10.7a	48.3 ± 10.9a	18.4 ± 2.7c	40.6 ± 12.3b
WOW
with single culture	30	54.9 ± 12.4c	42.0 ± 11.2b	12.9 ± 2.1a	32.5 ± 8.1a

*Different superscripts in each column indicate significant differences (P < 0.05)