TABLE 4.

Results of fertility treatment.

		Pregnancy after ET after 2PN vitrification-warming n = 182 (38.9%)	No pregnancy after ET after 2PN vitrification-warming n = 286 (61.1%)	p-value
MII oocytes		n = 117	n = 188
		12.21 (±6.14)	10.55 (±5.43)	.012
Previous successful fresh transfer a		n = 45	n = 98
	Yes	43 (95.6%)	81 (82.7%)	.035
Number of previous miscarriages		n = 137	n = 234
	0	112 (81.8%)	191 (81.6%)	.921
	1	18 (13.1%)	28 (12.0%)
	2	3 (2.2%)	5 (2.1%)
	>2	4 (2.9%)	10 (4.3%)

ET, embryo transfer.

Wilcoxon-Mann-Whitney test for ordinal variables, Chi-squared-test for categorical variables.

MII, metaphase II oocytes.

^a Resulted in a pregnancy.