Table 3 Pregnancy outcomes
|  | Overalla (n = 873) | Type of first embryo transfer | |
|---|---|---|---|
Fresh (n = 823) | Frozen (n = 50) | ||
Number of embryos transferred | 2.5 ± 0.6 | 2.5 ± 0.6 | 2.5 ± 0.6 |
After first embryo transfer | |||
 Live birth, n (%) | 277 (31.7) | 263 (32.0) | 14 (28.0) |
  Singleton | 175/277 (63.2) | 165/263 (62.7) | 10/14 (71.4) |
  Twins | 102/277 (36.8) | 98/263 (37.3) | 4/14 (28.6) |
 Positive beta hCG, n (%) | 438 (50.2) | 417 (50.7) | 21 (42.0) |
 Clinical pregnancy, n (%) | 380 (43.5) | 361 (43.9) | 19 (38.0) |
 Ongoing pregnancy, n (%) | 286 (32.8) | 272 (33.0) | 14 (28.0) |
 Implantation, % | 25.1 | 25.3 | 20.7 |
 Ectopic pregnancy, n (%) | 12 (1.4) | 11 (1.3) | 1 (2.0) |
 Miscarriage (before 12 weeks), n (%) | 81 (9.3) | 76 (9.2) | 5 (10.0) |
 Miscarriage (between 12 and 24 weeks), n (%) | 9 (1.0) | 9 (1.1) | 0 (0.0) |
 Birth weight, g | |||
  Singleton | 2980.7 ± 733.4 | 2951.3 ± 737.2 | 3433.3 ± 625.0 |
  Twins | 2325.8 ± 545.5 | 2302.1 ± 538.1 | 2412.5 ± 513.2 |
At 12Â months | |||
 Total number of embryo transfers, n (%)b | |||
  1 | 779 (89.2) |  |  |
  2 | 87 (10.0) |  |  |
  3 | 7 (0.8) |  |  |
 Live birth, n (%) | 294 (33.7) |  |  |
  Singleton | 192/294 (65.3) |  |  |
  Twins | 102/294 (34.7) |  |  |
 Positive beta hCG, n (%) | 508 (58.2) |  |  |
 Clinical pregnancy, n (%) | 440 (50.4) |  |  |
 Ongoing pregnancy, n (%) | 326 (37.3) |  |  |
 Implantation, % | 25.6 |  |  |
 Ectopic pregnancy, n (%) | 14 (1.6) |  |  |
 Miscarriage (before 12 weeks), n (%) | 102 (11.6) |  |  |
 Miscarriage (between 12 and 24 weeks), n (%) | 9 (1.0) |  |  |
 Birth weight, g | |||
  Singleton | 2969.9 ± 737.3 |  |  |
  Twins | 2307.2 ± 536.0 |  |  |