Table 3.

Comparison of pregnancy rates between grades A^*, B^** and C embryos^*** in FET^**** cycles

Variable	Chemical pregnancy			Clinical pregnancy
	Odds ratio	95%CI	P-value	Odds ratio	95%CI	P-value†
Age	0.99	0.94–1.94	0.8	0.99	0.95–1.04	0.91
Number of transferred embryos	0.79	0.4–1.56	0.51	1.19	0.77–1.83	0.41
Embryo grade	1.27	0.85–1.91	0.23	0.77	0.37–1.57	0.47

CI = confidence interval

^*The embryos with regular size blastomere, and no fragmentation

^**The embryos with uneven blastomeres and/or less than 10% fragmentation

^***The embryos with more than 10% but no more than 25% of blastomeres

^****FET

^†Logistic regression