Table 3.
Comparison of the basic characteristics of the four subgroups
| 3A | 3B | 5A | 5B | P | |
|---|---|---|---|---|---|
| n | 306 | 792 | 115 | 207 | |
| Age (y) | 32.55 ± 4.45 | 32.45 ± 4.26 | 32.19 ± 4.47 | 32.35 ± 4.38 | 0.884 |
| Type of infertility | |||||
| Primary infertility (%) | 45.1% (138/306) | 41.5% (329/792) | 40.9% (47/115) | 34.3% (71/207) | 0.110 |
| Secondary infertility (%) | 54.9% (168/306) | 58.5% (463/792) | 59.1% (68/115) | 65.7% (136/207) | 0.110 |
| Years of infertility (y) | 3.71 ± 2.66 | 3.55 ± 2.40 | 3.44 ± 2.48 | 3.19 ± 2.47 | 0.130 |
| Infertility factors | |||||
| Fallopian tube factor (%) | 98.4% (301/306) | 98.5% (780/792) | 99.1% (114/115) | 100.0% (207/207) | 0.272 |
| Male factor (%) | 9.5% (29/306) | 11.1% (88/792) | 7.8% (9/115) | 5.3% (11/207) | 0.070 |
| Immunological factors (%) | 0 | 0.1% (1/792) | 0.9% (1/115) | 0 | 0.286 |
| Unspecified reasons (%) | 0.3% (1/306) | 0.1% (1/792) | 0.9% (1/115) | 0 | 0.231 |
| Repeated implant failure (%) | 6.2% (19/306) | 7.7% (61/792) | 7.8% (9/115) | 5.8% (12/207) | 0.700 |
| Recurrent spontaneous abortion (%) | 0 | 0.5% (4/792) | 0 | 1.0% (2/207) | 0.363 |
| BMI (kg/m2) | 24.22 ± 3.79 | 24.08 ± 3.68 | 23.95 ± 3.84 | 23.70 ± 3.56 | 0.466 |
| AMH (ng/ml) | 5.21 ± 3.21 | 5.28 ± 3.01 | 5.65 ± 3.15 | 5.67 ± 3.64 | 0.253 |
| FSH (mIU/ml) | 6.90 ± 3.21 | 7.10 ± 2.42 | 6.94 ± 2.05 | 7.04 ± 3.90 | 0.750 |
| LH (mIU/ml) | 6.37 ± 4.33 | 6.51 ± 4.15 | 6.38 ± 3.38 | 6.88 ± 5.96 | 0.620 |
| E2 (pg/ml) | 37.10 ± 13.40 | 38.01 ± 12.69 | 36.45 ± 17.28 | 37.72 ± 12.58 | 0.560 |
| P (ng/ml) | 0.38 ± 0.18 | 0.36 ± 0.18 | 0.38 ± 0.18 | 0.35 ± 0.18 | 0.083 |
| T (ng/ml) | 0.49 ± 0.36 | 0.49 ± 0.31 | 0.48 ± 0.32 | 0.46 ± 0.28 | 0.693 |
| Basal endometrial thickness (mm) | 5.28 ± 1.21 | 5.31 ± 1.20 | 5.60 ± 1.57 | 5.37 ± 1.25 | 0.111 |
| Number of quality embryos transferred | 0.64 ± 0.63 | 0.58 ± 0.62 | 0.43 ± 0.50 | 0.39 ± 0.49 | 0.001 |
| Previous embryo transfer times | 0.68 ± 1.01 | 0.76 ± 1.13 | 0.68 ± 1.22 | 0.92 ± 1.42 | 0.125 |