Table 2.
Cycle characteristics of the participants.
| Ultra-long GnRH-a protocol (n=237) | Long GnRH-a protocol (n=134) | p value | |
|---|---|---|---|
| Total dose of gonadotropin (IU) | 2629.00 ± 858.77 | 2630.40 ± 913.95 | 0.988 |
| Duration of stimulation (d) | 11.29 ± 2.81 | 11.31 ± 2.78 | 0.95 |
| Endometrial thickness in HCG day (mm) | 10.82 ± 2.85 | 10.95 ± 3.00 | 0.678 |
| Peak E2 (pmol/L) | 8639.18 ± 5180.09 | 10039.03 ± 6883.23 | 0.01 |
| No. of oocytes retrieved per cycle | 8.31 ± 5.42 | 9.93 ± 7.04 | 0.004 |
| No. of embryos available per cycle | 3.89 ± 2.87 | 4.34 ± 3.16 | 0.17 |
| No. of high-quality embryos per cycle | 1.56 ± 1.97 | 1.61 ± 1.73 | 0.788 |
| High-quality embryos transferred, n (%) | 181/389 (46.5) | 73/162 (45.1) | 0.753 |
| No. of embryos transferred per cycle | 2.05 ± 0.57 | 2.05 ± 0.55 | 0.965 |
| Stage at ET, n (%) | 0.491 | ||
| Day 3 | 176/190 (92.6) | 75/79 (94.9) | |
| Day 5 | 14/190 (7.4) | 4/79 (5.1) | |
| Type of ART, n (%) | 0.850 | ||
| IVF | 191/233 (82.0) | 101/127 (79.5) | |
| ICSI | 32/233 (13.7) | 20/127 (15.7) | |
| IVF+ICSI | 10/233 (4.3) | 6/127 (4.7) | |
| Moderate OHSS (n, %) | 3 (1.3) | 2 (1.5) | 1.000 |
| Cancellation of fresh ET, n (%) | 47 (19.8) | 55 (41.0) | 0.000 |
Data are presented as mean ± SD or number (%).
ART, assisted reproductive technology; ET, embryos transferred.
IVF, in vitro fertilization; ICSI, intracytoplasmic sperm injection.