Table 1 Patients’ general characteristics
Item | Spring | Summer | Autumn | Winter | F/ χ2 | P value |
|---|---|---|---|---|---|---|
Cycle number | 659 | 578 | 519 | 534 | ||
Age (year) | 29.00 ± 2.98 | 28.88 ± 2.99 | 28.76 ± 2.97 | 29.07 ± 2.99 | 1.142 | 0.331 |
Type of infertility | 1.710 | 0.635 | ||||
Primary infertility (%) | 43.70% (288/659) | 41.18% (238/578) | 40.08% (208/519) | 41.95% (224/534) | ||
Secondary infertility (%) | 56.30% (371/659) | 58.82% (340/578) | 59.92% (311/519) | 58.05% (310/534) | ||
Duration of infertility (year) | 3.21 ± 2.41 | 3.11 ± 2.37 | 2.96 ± 2.20 | 2.92 ± 2.26 | 2.057 | 0.104 |
Infertility factor | ||||||
Tubal factor (%) | 93.78% (618/659) | 94.29% (545/578) | 93.45% (485/519) | 93.63% (500/534) | 0.375 | 0.945 |
Ovulatory dysfunction (%) | 4.25% (28/659) | 4.15% (24/578) | 4.43% (23/519) | 4.87% (26/534) | 0.399 | 0.940 |
Unexplained (%) | 1.97% (13/659) | 1.56% (9/578) | 2.12% (11/519) | 1.50% (8.534) | 0.882 | 0.830 |
BMI (kg/m2) | 22.48 ± 2.42 | 22.39 ± 2.33 | 22.31 ± 2.29 | 22.49 ± 2.36 | 0.672 | 0.569 |
Basal E2 level (pg/ml) | 38.37 ± 18.41 | 38.94 ± 18.60 | 38.82 ± 23.79 | 38.20 ± 23.84 | 0.160 | 0.923 |
Basal FSH level (mIU/ml) | 6.65 ± 1.12 | 6.73 ± 1.15 | 6.82 ± 1.12 | 6.77 ± 1.16 | 2.253 | 0.080 |
Basal LH level (mIU/ml) | 5.19 ± 2.40 | 5.33 ± 2.61 | 5.38 ± 2.93 | 5.05 ± 2.56 | 1.744 | 0.156 |
Basal AMH level (ng/ml) | 3.30 ± 1.92 | 3.53 ± 2.22 | 3.62 ± 2.13 | 3.31 ± 1.85 | 2.459 | 0.061 |
AFC (n) | 14.97 ± 5.28 | 14.96 ± 5.36 | 15.08 ± 5.42 | 14.55 ± 5.33 | 0.996 | 0.394 |