Table 4.
Clinical pregnancy rate of complete data cycles.
| Item | Group A, n(%) Letrozole 2.5 mg + FSH |
Group B, n(%) Letrozole 5 mg + FSH |
RR (95%CI) | P-value | |
|---|---|---|---|---|---|
| Complete data analysis | n=209 | n=231 | |||
| Clinical pregnancy rate | 80/209(38.3%) | 64/231(27.7%) | 1.38(1.05,1.81) | 0.018 | |
| Age,years | ≤ 28 | 45/119(37.8%) | 41/139(29.5%) | 1.28(0.91,1.81) | 0.158 |
| > 28 | 35/90(38.9%) | 23/92(25%) | 1.56(1,2.41) | 0.044 | |
| BMI, kg/m2 | < 24 | 53/137(38.7%) | 44/134(32.8%) | 1.18(0.86,1.62) | 0.315 |
| ≥ 24 | 27/72(37.5%) | 20/97(20.6%) | 1.82(1.11,2.97) | 0.015 | |
| One mature follicle | No | 15/40(37.5%) | 23/82(28%) | 1.34(0.79,2.27) | 0.29 |
| Yes | 65/169(38.5%) | 41/149(27.5%) | 1.4(1.01,1.93) | 0.039 | |
| Hormone concentration on HCG injection day | |||||
| LH, IU/L | ≤ 10 | 40/104(38.5%) | 37/136(27.2%) | 1.41(0.98,2.04) | 0.064 |
| > 10 | 40/105(38.1%) | 27/95(28.4%) | 1.34(0.9,2) | 0.148 | |
| Oestradiol, pg/ml | ≤ 200 | 25/82(30.5%) | 24/122(19.7%) | 1.55(0.95,2.52) | 0.076 |
| > 200 | 55/127(43.3%) | 40/109(36.7%) | 1.18(0.86,1.62) | 0.302 | |
| Progesterone, ng/ml | ≤ 0.25 | 47/119(39.5%) | 34/113(30.1%) | 1.31(0.92,1.88) | 0.133 |
| > 0.25 | 33/90(36.7%) | 30/118(25.4%) | 1.44(0.96,2.18) | 0.08 | |
| Endometrial thickness on ovulation day, mm | ≤ 10 | 40/130(30.8%) | 30/119(25.2%) | 1.22(0.82,1.83) | 0.33 |
| > 10 | 40/79(50.6%) | 34/112(30.4%) | 1.67(1.17,2.38) | 0.005 | |
| Cycle | 1 | 40/106(37.7%) | 31/105(29.5%) | 1.28(0.87,1.88) | 0.207 |
| 2~3 | 40/103(38.8%) | 33/126(26.2%) | 1.48(1.01,2.17) | 0.041 | |