| Study variables | pregnancy | |
| Positive | Negative | |
| Progesterone level at day of HCG trigger | ||
| Less than 0.9 | 358 (49.7) | 353 (47.9) |
| 0.9-below | 210 (29.2) | 184 (25.0) |
| 1.5 - 2 | 56 (7.8) | 75 (10.1) |
| 2 - 2.5 | 31 (4.3) | 39 (5.3) |
| More than 2.5 | 65 (9.0) | 86 (11.7) |
| Total | 720 (100.0) | 736 (100.0) |