Table 2.
Reproductive outcomes following transferring blastocyst stage embryo
| Characteristics | Underweight (< 18.5 kg/m2 N=1315) | Normal weight (18.5–24.9 kg/m2 N=6230) | Overweight (≥25 kg/m2 N=1210) | Underweight vs. normal weight | Overweight vs. normal weight | Overweight vs. underweight |
|---|---|---|---|---|---|---|
| Number of FET | 1315 | 6230 | 1210 | |||
| Number of viable embryos after thawed | 2390 | 11,440 | 2193 | |||
| Embryo quality | 0.296 | 0.171 | 0.402 | |||
| High-quality embryos | 2321 (97.11%) | 11,135 (97.33%) | 2126 (96.95%) | |||
| Low-quality embryos | 69 (2.89%) | 305 (2.67%) | 67 (3.05%) | |||
| Clinical pregnancy rate per transfer,%(n) | 48.14%(633/1315) | 53.85%(3355/6230) | 51.32%(621/1210) | 0.018 | 0.193 | 0.186 |
| Implantation rate,%(n) | 33.56%(802/2390) | 37.26%(4263/11440) | 35.48%(778/2193) | 0.019 | 0.145 | 0.178 |
| Miscarriage rate,%(n) | 12.64%(80/633) | 10.73%(360/3355) | 13.37%(83/621) | 0.119 | < 0.001 | 0.401 |
| Multiple pregnancy rate,%(n) | 26.69%(169/633) | 27.06%(908/3355) | 25.28%(157/621) | 0.464 | 0.257 | 0.354 |
| Ectopic pregnancy rate,%(n) | 2.59%(17/654) | 2.41%(81/3364) | 2.04%(13/637) | 0.431 | 0.352 | 0.321 |
| Intrauterine and ectopic pregnancy rate,%(n) | 0.61%(4/654) | 0.83%(28/3364) | 0.47%(3/637) | 0.387 | 0.251 | 0.515 |
| Ongoing pregnancy rate,%(n) | 43.04%(566/1315) | 50.47%(3144/6230) | 46.45%(562/1210) | 0.002 | 0.071 | 0.152 |
| Live birth rate,%(n) | 42.05%(553/1315) | 45.97%(2864/6230) | 43.64%(528/1210) | 0.057 | 0.187 | 0.319 |