Table 2 Pregnancy outcomes of single 0PN blastocyst transfers in two groups
|  |  < 6 cells | P-Value |  ≥ 6 cells | P-Value | ||
|---|---|---|---|---|---|---|
|  | 0PN (N = 23) | 2PN (N = 1145) | 0PN (N = 219) | 2PN (N = 2418) | ||
Embryo development stage |  |  | 0.993 |  |  |  < 0.001 |
 Day 5 | 17.4 (4/23) | 15.1 (173/1145) |  | 56.2 (123/219) | 35.6 (860/2418) |  |
 Day 6 | 82.6 (19/23) | 84.9 (972/1145) |  | 43.8 (96/219) | 64.4 (1558/2418) |  |
Biochemical pregnancy rate (%) | 0 (0/23) | 5.6 (64/1145) | 0.482 | 4.1 (9/219) | 5.2 (126/2418) | 0.479 |
Clinical pregnancy rate (%) | 30.4 (7/23) | 39.8 (456/1145) | 0.362 | 50.7 (111/219) | 46.6 (1122/2418) | 0.246 |
Ectopic pregnancy rate (%) | 0 (0/7) | 0.9 (4/456) | 1.000 | 0.9 (1/111) | 1.2 (13/1114) | 1.000 |
Miscarriage rate (%) | 0 (0/7) | 20.6 (94/456) | 0.383 | 20.7 (23/111) | 16.7 (183/1114) | 0.282 |
Live birth rate (%) | 30.4 (7/23) | 31.3 (358/1145) | 0.932 | 39.7 (87/219) | 38.3 (926/2418) | 0.677 |
 Singleton | 30.4 (7/23) | 30.4 (348/1145) |  | 38.8 (85/219) | 37.3 (902/2418) |  |
 Multiple | 0 (0/23) | 0.9 (10/1145) |  | 0.9 (2/219) | 1.0 (24/2418) |  |