Table 4.
Risk factors of HP.
| Risk factors of HP | Odds risk (95% CI) |
| Tubal factor | 4.185 (1.080–16.217) |
| Pelvic adhesion | 5.552 (1.677–18.382) |
| More than 2 embryos transferred | 23.253 (1.804–299.767) |
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