Table 5.

Clinical characteristics and IVF laboratory parameters of PCOS patients in different levels of TL

Characteristics	TL <1 group (N = 41)	TL ≥1 group (N = 24)	P a
Age, years, mean ± SD	30.3 ± 3.6	30.1 ± 5.3	0.834
BMI, kg/m2, median (IQR)	21.6 (20.2–23.7)	21.6 (18.7–23.9)	0.693
Duration of infertility, y, median (IQR)	5 (3–7)	3 (2–4)	0.006*
Basal serum FSH level, IU/L, mean ± SD	6.9 ± 2.3	6.6 ± 1.4	0.505
Basal serum LH level, IU/L, median (IQR)	6.9 (4.3–11.9)	5.2 (4.1–7.2)	0.073
FSH/LH, median (IQR)	1.0 (0.6–1.5)	1.2 (0.9–1.8)	0.082
Basal serum testosterone level, nmol/L, median (IQR)	1.8 (1.1–2.3)	1.8 (1.5–2.4)	0.605
Retrieved oocytes, median (IQR)	15 (12–22)	14 (10–17)	0.273
Metaphase II oocytes, mean ± SD	15 ± 6	13 ± 5	0.202
Proportion of mature oocytes, %, median (IQR)	92.9 (86.2–100)	91.3 (80.0–100)	0.589
Available embryos, mean ± SD	10 ± 5	8 ± 4	0.206
Good quality embryos, median (IQR)	3 (1–5)	3 (1–5)	0.848
Rate of good quality embryos, median (IQR)	33.3 (7.8–54.4)	33.3 (19.9–67.1)	0.309
Serum estrogen level on HCG day/retrieved oocytes, ng/L, mean ± SD	219 ± 93	290 ± 144	0.043*
Serum estrogen level on HCG day/metaphase II oocytes, ng/L, mean ± SD	245 ± 88	331 ± 159	0.024*
Pregnancy rate, n (%)	18 (60.0)	12 (57.1)	0.838
Miscarriage rate, n (%)	0 (0)	2 (16.7)	0.152
Cumulative pregnancy rate, n (%)	31 (77.5)	16 (69.6)	0.486
Cumulative rate of taking baby home, n (%)	27 (67.5)	13 (56.5)	0.384
Cumulative miscarriage rate, n (%)	4 (12.9)	3 (18.8)	0.676

*P < 0.05 was considered statistically significant

^a P values: t test for age, basal serum FSH level, metaphase II oocytes, available embryos, serum estrogen level on HCG day/retrieved oocytes and serum estrogen level on HCG day/metaphase II oocytes; Mann–Whitney U test for other continuous variables; chi-square or Fisher’s exact test for categorical variables