Table 1 Basic data and transplant characteristics of women with OHSS and without OHSS
Characteristic | OHSS Group (n = 342) | Matched Control (n = 342) | P value |
|---|---|---|---|
Maternal age (y) | 28.32 ± 3.55 | 28.32 ± 3.55 | 1.000 |
Paternal age (y) | 29.83 ± 4.13 | 29.71 ± 4.26 | 0.695 |
BMI (kg/m2) | 22.33 ± 3.07 | 22.82 ± 2.43 | 0.051 |
Duration of infertility (y) | 3.01 ± 1.95 | 3.18 ± 2.01 | 0.256 |
Types of infertility (%, n) | Â | Â | 1.000 |
 Primary infertility | 66.08 (226/342) | 66.08 (226/342) |  |
 Secondary infertility | 33.92 (116/342) | 33.92 (116/342) |  |
Number of pregnancies | 0.54 ± 0.91 | 0.60 ± 1.04 | 0.433 |
Indication of infertility (%, n) | Â | Â | 0.952 |
 Tubal factor | 31.58 (108/342) | 29.53 (101/342) |  |
 PCOS | 34.80 (119/342) | 35.67 (122/342) |  |
 Male factor | 28.07 (96/342) | 28.95 (99/342) |  |
 Other | 5.56 (19/342) | 5.85 (20/342) |  |
Basal serum sex hormone levels | |||
 FSH (pmol/L) | 6.18 ± 1.53 | 6.93 ± 1.82 | < 0.001 |
 E2 (pmol/L) | 161.50 ± 89.14 | 176.24 ± 133.20 | 0.089 |
 PRL (pmol/L) | 25.54 ± 65.47 | 18.70 ± 31.87 | 0.083 |
 LH (pmol/L) | 7.75 ± 5.34 | 6.97 ± 5.23 | 0.054 |
 T (pmol/L) | 3.55 ± 10.74 | 2.92 ± 8.26 | 0.387 |
Iatrogenic ovarian stimulation (%, n) | Â | Â | 0.860 |
 Long protocol (Long term effect) | 57.02 (195/342) | 55.97 (188/342) |  |
 Antagonist protocol | 40.25 (138/342) | 42.40 (145/342) |  |
 Other | 2.63 (9/342) | 2.63 (9/342) |  |
Total Gn dosage (U) | 1849.46 ± 561.80 | 1996.26 ± 735.41 | *0.003 |
Total days of Gn (day) | 10.72 ± 1.83 | 10.98 ± 2.35 | 0.106 |
Number of follicles | |||
 Total follicles | 23.26 ± 7.34 | 15.49 ± 7.11 | *0.000 |
 Left ovary | 10.95 ± 4.00 | 7.63 ± 4.81 | *0.000 |
 Right ovary | 12.32 ± 4.61 | 7.86 ± 3.56 | *0.000 |
Trigger day | |||
 Endometrial thickness (mm) | 11.78 ± 2.46 | 11.82 ± 2.42 | 0.830 |
 E2 (pmol/L) | 17,850.03 ± 9588.84 | 14,313.96 ± 4400.77 | *< 0.001 |
 LH (pmol/L) | 2.66 ± 3.08 | 3.04 ± 3.39 | 0.164 |
 P (pmol/L) | 6.38 ± 3.13 | 4.24 ± 2.66 | *< 0.001 |
Number of retrieved oocytes | 25.47 ± 6.38 | 15.37 ± 6.88 | *< 0.001 |
Number of transplantable embryos | 9.65 ± 4.32 | 6.32 ± 3.70 | *< 0.001 |
Number of high-quality embryos | 8.46 ± 4.25 | 5.54 ± 3.54 | *< 0.001 |
Transplant interval (day) | 95.77 ± 43.55 | 92.93 ± 48.39 | 0.419 |
Number of transferred embryos | 1.32 ± 0.47 | 1.31 ± 0.46 | 0.805 |