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Table 1 Characteristics and outcomes of surplus morulas and frozen ET cycles

From: Developmental potential of surplus morulas with delayed and/or incomplete compaction after freezing-thawing procedures

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%
  1. aExcluding cycles in which embryos transferred were from mixed frozen-thawed blastocysts and cancelled cycles
  2. bIncluding two sets of monozygotic twins