Table 3.
Events of HP.
| Factors, n (%) | HP (n = 22) | IUP (n = 125) | P |
| Age | .304 | ||
| <30 y old | 13 (59.1) | 59 (47.2) | |
| ≥30 y old | 9 (40.9) | 66 (52.8) | |
| Previous EP | .292 | ||
| Yes | 7 (31.8) | 24 (19.2) | |
| No | 15 (68.2) | 101 (80.0) | |
| Previous abortions | .894 | ||
| Yes | 7 (31.8) | 38 (30.4) | |
| No | 15 (68.2) | 87 (69.6) | |
| Previous live births | .266 | ||
| Yes | 3 (13.6) | 6 (4.8) | |
| No | 19 (86.4) | 119 (95.2) | |
| Pelvic surgery history | .107 | ||
| Yes | 17 (77.3) | 74 (59.2) | |
| No | 5 (22.7) | 51 (40.8) | |
| Type of IVF, n (%) | .203 | ||
| Fresh cycle | 17 (77.3) | 112 (89.6) | |
| Frozen-thawed cycle | 5 (22.7) | 13 (10.4) | |
| Number of transferred embryos | .007 | ||
| 2 | 19 (86.4) | 124 (99.2) | |
| 3 | 3 (13.6) | 1 (0.08) | |
| Stage of transferred embryos | .938 | ||
| Day 3/cleavage stage | 19 (86.4) | 112 (89.6) | |
| Day 5/blastocyst stage | 3 (13.6) | 13 (10.4) | |
| Infertility factors | |||
| Tubal infertility | <.001 | ||
| Yes | 19 (86.4) | 24 (19.2) | |
| No | 3 (13.6) | 101 (80.8) | |
| Pelvic adhesion | .004 | ||
| Yes | 7 (31.8) | 10 (8.0) | |
| No | 15 (68.2) | 115 (92.0) |