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. 2024 Jan 15;14:1294339. doi: 10.3389/fendo.2023.1294339

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