Table 4.
IVF-ET cycle characteristics resulting in pregnancies with and without placenta praevia.
| Pregnancies with placenta praevia N = 32 |
Pregnancies without placenta praevia N = 1095 |
P | |
|---|---|---|---|
| Day of ET | |||
| 2 | 0 | 14 (1.3%) | 0.775 |
| 3 | 0 | 9 (0.8%) | |
| 4 | 0 | 1 (<0.1%) | |
| 5 | 32 (100%) | 1037 (94.7%) | |
| 6 | 0 | 34 (3.1%) | |
| Number of morulae and blastocysts on day 5 | |||
| 2 or 3 | 18 (56%) | 610 (56%) | 0.410 |
| 4 or 5 | 10 (31%) | 258 (23%) | |
| 6 or more | 3 (3%) | 222 (21%) | |
| ET number (1 or 2) and embryo quality (poor/good)** | ∗ | ||
| 1—poor embryo | 0 | 13 (1%) | 0.491 |
| 2—poor/poor embryo | 3 (9%) | 76 (7%) | |
| 1—good embryo | 6 (19%) | 153 (14%) | |
| 2—good/poor embryo | 2 (6%) | 197 (18%) | |
| 2—good/good embryo | 21 (66%) | 461 (42%) | |
| Stimulation protocol | ∗ | ||
| Long protocol | 18 (56%) | 685 (63%) | 0.403 |
| Short protocol | 14 (44%) | 359 (33%) |
*24 data on stimulation in a group of pregnancies without placenta praevia missing and 18 data on embryo quality in group without placenta praevia missing.
**Good quality: good blastocysts quality according to Gardner criteria [24] on day 5 or 6, cleavage stage embryo with little (<10%) or no fragmentation on day 2 or 3, and equal (round) blastomeres on day 2 or 3. Poor quality: embryos not reaching the criteria for good quality.