TABLE 3.
Characteristics and treatment outcomes of FET cycles in ART clinics in Japan for 2018
| Variables | FET | Others a | Total |
|---|---|---|---|
| No. of registered cycles | 202 229 | 1017 | 203 246 |
| No. of FET | 199 022 | 892 | 199 914 |
| No. of cycles with pregnancy | 69 072 | 285 | 69 357 |
| Pregnancy rate per FET | 34.7% | 32.0% | 34.7% |
| SET cycles | 167 898 | 743 | 168 641 |
| Pregnancy following SET cycles | 59 899 | 242 | 60 141 |
| Rate of SET cycles | 84.4% | 83.3% | 83.4% |
| Pregnancy rate following SET cycles | 35.7% | 32.6% | 35.7% |
| Miscarriages | 17 601 | 69 | 17 670 |
| Miscarriage rate per pregnancy | 25.5% | 24.2% | 25.5% |
| Singleton pregnancies b | 65 556 | 266 | 65 822 |
| Multiple pregnancies b | 2015 | 9 | 2024 |
| Twin pregnancies b | 1980 | 8 | 1988 |
| Triplet pregnancies b | 31 | 1 | 32 |
| Quadruplet pregnancies b | 3 | 0 | 3 |
| Multiple pregnancy rate b | 3.0% | 3.3% | 3.0% |
| Live births | 47 873 | 208 | 48 081 |
| Live birth rate per FET | 24.1% | 23.3% | 24.1% |
| Total number of neonates | 49 148 | 212 | 49 360 |
| Singleton live births | 46 432 | 200 | 46 632 |
| Twin live births | 1335 | 6 | 1341 |
| Triplet live births | 14 | 0 | 14 |
| Quadruplet live births | 1 | 0 | 1 |
| Pregnancy outcomes | |||
| Ectopic pregnancies | 350 | 1 | 351 |
| Heterotopic pregnancy | 9 | 0 | 9 |
| Artificial abortions | 272 | 0 | 272 |
| Still births | 236 | 1 | 237 |
| Fetal reduction | 16 | 0 | 16 |
| Unknown cycles for pregnancy outcomes | 1999 | 3 | 2002 |
Abbreviations: FET, frozen‐thawed embryo transfer; SET, single embryo transfer.
a
Including cycles using frozen‐thawed oocyte.
b
Singleton, twin, triplet and quadruplet pregnancies were defined according to the numbers of gestational sacs in utero.