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Table 1 The comparison of characteristics and COH parameters between pregnant and non-pregnant women
| Group 1 | Group 2 | |||||
|---|---|---|---|---|---|---|
| Variables | Non-pregnant cycles (n = 89) | Pregnant cycles (n = 72) | P value | Non-pregnant cycles (n = 403) | Pregnant cycles (n = 518) | P value |
| Age (years) | 32.2 ± 4.0 | 32.7 ± 3.8 | 0.352 | 31.9 ± 4.0 | 31.1 ± 4.1 | 0.003 |
| BMI (kg/m2) | 22.4 ± 2.9 | 2.2 ± 2.6 | 0.696 | 9.4 ± 1.5 | 9.4 ± 1.4 | 0.312 |
| Pregnancy history | 0.6 ± 0.5 | 0.6 ± 0.5 | 0.628 | 9.0 ± 3.9 | 9.0 ± 3.8 | 0.930 |
| Basal FSH levels (IU/L) | 11.8 ± 1.9 | 11.6 ± 1.7 | 0.424 | 7.5 ± 1.4 | 7.5 ± 1.4 | 0.947 |
| Basal LH levels (IU/L) | 5.4 ± 1.9 | 5.0 ± 2.1 | 0.260 | 4.3 ± 2.2 | 4.3 ± 2.2 | 0.974 |
| Basal E2 levels (pg/ml) | 43.3 ± 20.8 | 41.6 ± 18.3 | 0.581 | 43.3 ± 30.5 | 41.2 ± 31.4 | 0.300 |
| Basal T levels (ng/dl) | 48.3 ± 17.3 | 40.8 ± 18.1 | 0.008 | 47.8 ± 18.9 | 47.7 ± 19.9 | 0.907 |
| Antral follicle count | 9.8 ± 4.3 | 8.6 ± 4.6 | 0.099 | 11.6 ± 5.5 | 11.2 ± 5.7 | 0.217 |
| Starting dose of gonadotropins (IU) | 223.3 ± 54.6 | 228.1 ± 67.3 | 0.617 | 203.6 ± 36.7 | 198.6 ± 40.7 | 0.053 |
| Number of oocytes retrieved | 10.0 ± 4.4 | 9.0 ± 4.7 | 0.171 | 12.4 ± 5.4 | 12.4 ± 5.3 | 0.999 |
| Number of follicles >14 mm | 7.8 ± 3.5 | 7.1 ± 3.5 | 0.176 | 9.0 ± 3.9 | 9.0 ± 3.8 | 0.761 |
| Days of stimulation | 9.7 ± 1.6 | 10.5 ± 1.9 | 0.002 | 9.4 ± 1.5 | 9.4 ± 1.4 | 0.744 |
| Total dose of gonadotropins (IU) | 2477.8 ± 873.9 | 2936.1 ± 1249.9 | 0.010 | 2174.2 ± 826.8 | 2042.3 ± 728.7 | 0.012 |
| Endometrial thickness on HCG day (cm) | 1.1 ± 0.2 | 1.1 ± 0.2 | 0.521 | 1.0 ± 0.2 | 1.1 ± 0.2 | 0.001 |
| Fertilization rate | 0.8 ± 0.2 | 0.7 ± 0.2 | 0.202 | 0.7 ± 0.2 | 0.7 ± 0.2 | 0.615 |
| Number of embryos cryopreserved | 3.3 ± 2.9 | 2.4 ± 2.4 | 0.034 | 3.9 ± 3.4 | 4.1 ± 3.2 | 0.256 |
| Number of good quality embryos | 5.6 ± 2.9 | 4.5 ± 2.5 | 0.015 | 6.0 ± 3.4 | 6.3 ± 3.2 | 0.219 |
