| Negative (n = 266) | Ongoing pregnancy (n = 204) | P value | |
| Age | 29 (20 - 43) | 29 (21 - 43) | 0.02 |
| Age brackets | |||
| <35 | 203 (53.7) | 175 (46.3) | 0.01 |
| ≥35 | 63 (68.5) | 29 (31.5) | |
| Body mass index (kg/m2) | 22.3 (15.4 - 34.8) | 21.8 (16.7 - 30.8) | 0.38 |
| Body mass index (kg/m2) brackets | |||
| <30 | 259 (56.3) | 201 (43.7) | 0.52 |
| ≥30 | 7 (70) | 3 (30) | |
| Type of treatment Luteal phase support | |||
| VP + IMP | 95 (48) | 103 (52) | 0.01 |
| VP | 171 (62.9) | 101 (37.1) | |
| Day of starting progesterone | |||
| Estrogen level (pg/mL) | 260.1 (109 - 984) | 275.9 (119 - 848) | 0.12 |
| Endometrial thickness (mm) | 9.2 (7.1 - 13.1) | 9.2 (7.2 - 14.6) | 0.85 |
| Causes of infertility | |||
| Unexplained | 122 (58.1) | 88 (41.9) | 0.06 |
| Tubal factor | 20 (51.3) | 19 (48.7) | |
| Diminished ovarian reserve | 15 (83.3) | 3 (16.7) | |
| Endometrioma | 3 (25) | 9 (75) | |
| Male factor | 61 (53.5) | 53 (46.5) | |
| Recurrent implantation failure | 20 (64.5) | 11 (35.5) | |
| Ovulatory dysfunction | 25 (54.3) | 21 (45.7) | |
| Number of transferred embryos | 1 (1 - 2) | 2 (1 - 2) | <0.01 |
| Blastocyst morphology | |||
| Excellent | 71 (55) | 58 (45) | 0.78 |
| Good | 46 (51.7) | 43 (48.3) | |
| Average | 76 (55.5) | 61 (45.5) | |
| Poor | 58 (59.2) | 40 (40.8) | |