Table 1 Characteristics and outcomes of surplus morulas and frozen ET cycles
Characteristics | Outcomes |
|---|---|
Age (year) | 35.8 ± 3.8 |
Infertility factor (%) | |
 Male factor | 26.2 |
 Tubal factor | 29.2 |
 Ovarian factor | 22.9 |
 Multiple factors | 21.7 |
No. of FET cycles | 180 |
No. of FET cycles include only thawed morulas a | 128 |
Insemination methods (%) | |
 Conventional insemination | 67.0 |
 Intracytoplasmic sperm injection | 33.0 |
Endometrial preparation methods (%) | |
 Natural cycle | 17.8 |
 Artificial hormone replacement | 82.2 |
No. of surplus morulas thawed | 347 |
Morula development stage at fresh cycle | |
 No. of day 5 morulas (%) | 329 (94.8%) |
 No. of day 6 morulas (%) | 18 (5.2%) |
Morula grading at fresh cycle | |
 No. of M1 (%) | 54 (15.5%) |
 No. of M2 (%) | 138 (39.8%) |
 No. of M3 (%) | 155 (44.7%) |
Morula post-thaw survival rate (%) | 79.3 |
Morula to blastocyst formation rate (%) | 66.6 |
Morula to top-quality blastocyst formation rate (%) | 23.6 |
No. of morulas thawed per FET cycle | 2.1 ± 0.7 |
No. of embryos transferred per FET cycle | 1.7 ± 0.6 |
Clinical pregnancy rate (%) | 43/128 = 33.6% |
Implantation rate per transferred embryos (%) | 51/220 = 23.2% |
Ongoing pregnancy rate (%) | 35/128 = 27.3% |
Live birth rate (%) | 29/128 = 22.7% |
Abortion rate (%) | 7/43 = 16.3% |
Multiple pregnancy rate b (%) | 7/43 = 16.3% |